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/**
 * @output wp-admin/js/customize-controls.js
 */

/* global _wpCustomizeHeader, _wpCustomizeBackground, _wpMediaViewsL10n, MediaElementPlayer, console, confirm */
(function( exports, $ ){
	var Container, focus, normalizedTransitionendEventName, api = wp.customize;

	var reducedMotionMediaQuery = window.matchMedia( '(prefers-reduced-motion: reduce)' );
	var isReducedMotion = reducedMotionMediaQuery.matches;
	reducedMotionMediaQuery.addEventListener( 'change' , function handleReducedMotionChange( event ) {
		isReducedMotion = event.matches;
	});

	api.OverlayNotification = api.Notification.extend(/** @lends wp.customize.OverlayNotification.prototype */{

		/**
		 * Whether the notification should show a loading spinner.
		 *
		 * @since 4.9.0
		 * @var {boolean}
		 */
		loading: false,

		/**
		 * A notification that is displayed in a full-screen overlay.
		 *
		 * @constructs wp.customize.OverlayNotification
		 * @augments   wp.customize.Notification
		 *
		 * @since 4.9.0
		 *
		 * @param {string} code - Code.
		 * @param {Object} params - Params.
		 */
		initialize: function( code, params ) {
			var notification = this;
			api.Notification.prototype.initialize.call( notification, code, params );
			notification.containerClasses += ' notification-overlay';
			if ( notification.loading ) {
				notification.containerClasses += ' notification-loading';
			}
		},

		/**
		 * Render notification.
		 *
		 * @since 4.9.0
		 *
		 * @return {jQuery} Notification container.
		 */
		render: function() {
			var li = api.Notification.prototype.render.call( this );
			li.on( 'keydown', _.bind( this.handleEscape, this ) );
			return li;
		},

		/**
		 * Stop propagation on escape key presses, but also dismiss notification if it is dismissible.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		handleEscape: function( event ) {
			var notification = this;
			if ( 27 === event.which ) {
				event.stopPropagation();
				if ( notification.dismissible && notification.parent ) {
					notification.parent.remove( notification.code );
				}
			}
		}
	});

	api.Notifications = api.Values.extend(/** @lends wp.customize.Notifications.prototype */{

		/**
		 * Whether the alternative style should be used.
		 *
		 * @since 4.9.0
		 * @type {boolean}
		 */
		alt: false,

		/**
		 * The default constructor for items of the collection.
		 *
		 * @since 4.9.0
		 * @type {object}
		 */
		defaultConstructor: api.Notification,

		/**
		 * A collection of observable notifications.
		 *
		 * @since 4.9.0
		 *
		 * @constructs wp.customize.Notifications
		 * @augments   wp.customize.Values
		 *
		 * @param {Object}  options - Options.
		 * @param {jQuery}  [options.container] - Container element for notifications. This can be injected later.
		 * @param {boolean} [options.alt] - Whether alternative style should be used when rendering notifications.
		 *
		 * @return {void}
		 */
		initialize: function( options ) {
			var collection = this;

			api.Values.prototype.initialize.call( collection, options );

			_.bindAll( collection, 'constrainFocus' );

			// Keep track of the order in which the notifications were added for sorting purposes.
			collection._addedIncrement = 0;
			collection._addedOrder = {};

			// Trigger change event when notification is added or removed.
			collection.bind( 'add', function( notification ) {
				collection.trigger( 'change', notification );
			});
			collection.bind( 'removed', function( notification ) {
				collection.trigger( 'change', notification );
			});
		},

		/**
		 * Get the number of notifications added.
		 *
		 * @since 4.9.0
		 * @return {number} Count of notifications.
		 */
		count: function() {
			return _.size( this._value );
		},

		/**
		 * Add notification to the collection.
		 *
		 * @since 4.9.0
		 *
		 * @param {string|wp.customize.Notification} notification - Notification object to add. Alternatively code may be supplied, and in that case the second notificationObject argument must be supplied.
		 * @param {wp.customize.Notification} [notificationObject] - Notification to add when first argument is the code string.
		 * @return {wp.customize.Notification} Added notification (or existing instance if it was already added).
		 */
		add: function( notification, notificationObject ) {
			var collection = this, code, instance;
			if ( 'string' === typeof notification ) {
				code = notification;
				instance = notificationObject;
			} else {
				code = notification.code;
				instance = notification;
			}
			if ( ! collection.has( code ) ) {
				collection._addedIncrement += 1;
				collection._addedOrder[ code ] = collection._addedIncrement;
			}
			return api.Values.prototype.add.call( collection, code, instance );
		},

		/**
		 * Add notification to the collection.
		 *
		 * @since 4.9.0
		 * @param {string} code - Notification code to remove.
		 * @return {api.Notification} Added instance (or existing instance if it was already added).
		 */
		remove: function( code ) {
			var collection = this;
			delete collection._addedOrder[ code ];
			return api.Values.prototype.remove.call( this, code );
		},

		/**
		 * Get list of notifications.
		 *
		 * Notifications may be sorted by type followed by added time.
		 *
		 * @since 4.9.0
		 * @param {Object}  args - Args.
		 * @param {boolean} [args.sort=false] - Whether to return the notifications sorted.
		 * @return {Array.<wp.customize.Notification>} Notifications.
		 */
		get: function( args ) {
			var collection = this, notifications, errorTypePriorities, params;
			notifications = _.values( collection._value );

			params = _.extend(
				{ sort: false },
				args
			);

			if ( params.sort ) {
				errorTypePriorities = { error: 4, warning: 3, success: 2, info: 1 };
				notifications.sort( function( a, b ) {
					var aPriority = 0, bPriority = 0;
					if ( ! _.isUndefined( errorTypePriorities[ a.type ] ) ) {
						aPriority = errorTypePriorities[ a.type ];
					}
					if ( ! _.isUndefined( errorTypePriorities[ b.type ] ) ) {
						bPriority = errorTypePriorities[ b.type ];
					}
					if ( aPriority !== bPriority ) {
						return bPriority - aPriority; // Show errors first.
					}
					return collection._addedOrder[ b.code ] - collection._addedOrder[ a.code ]; // Show newer notifications higher.
				});
			}

			return notifications;
		},

		/**
		 * Render notifications area.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		render: function() {
			var collection = this,
				notifications, hadOverlayNotification = false, hasOverlayNotification, overlayNotifications = [],
				previousNotificationsByCode = {},
				listElement, focusableElements;

			// Short-circuit if there are no container to render into.
			if ( ! collection.container || ! collection.container.length ) {
				return;
			}

			notifications = collection.get( { sort: true } );
			collection.container.toggle( 0 !== notifications.length );

			// Short-circuit if there are no changes to the notifications.
			if ( collection.container.is( collection.previousContainer ) && _.isEqual( notifications, collection.previousNotifications ) ) {
				return;
			}

			// Make sure list is part of the container.
			listElement = collection.container.children( 'ul' ).first();
			if ( ! listElement.length ) {
				listElement = $( '<ul></ul>' );
				collection.container.append( listElement );
			}

			// Remove all notifications prior to re-rendering.
			listElement.find( '> [data-code]' ).remove();

			_.each( collection.previousNotifications, function( notification ) {
				previousNotificationsByCode[ notification.code ] = notification;
			});

			// Add all notifications in the sorted order.
			_.each( notifications, function( notification ) {
				var notificationContainer;
				if ( wp.a11y && ( ! previousNotificationsByCode[ notification.code ] || ! _.isEqual( notification.message, previousNotificationsByCode[ notification.code ].message ) ) ) {
					wp.a11y.speak( notification.message, 'assertive' );
				}
				notificationContainer = $( notification.render() );
				notification.container = notificationContainer;
				listElement.append( notificationContainer ); // @todo Consider slideDown() as enhancement.

				if ( notification.extended( api.OverlayNotification ) ) {
					overlayNotifications.push( notification );
				}
			});
			hasOverlayNotification = Boolean( overlayNotifications.length );

			if ( collection.previousNotifications ) {
				hadOverlayNotification = Boolean( _.find( collection.previousNotifications, function( notification ) {
					return notification.extended( api.OverlayNotification );
				} ) );
			}

			if ( hasOverlayNotification !== hadOverlayNotification ) {
				$( document.body ).toggleClass( 'customize-loading', hasOverlayNotification );
				collection.container.toggleClass( 'has-overlay-notifications', hasOverlayNotification );
				if ( hasOverlayNotification ) {
					collection.previousActiveElement = document.activeElement;
					$( document ).on( 'keydown', collection.constrainFocus );
				} else {
					$( document ).off( 'keydown', collection.constrainFocus );
				}
			}

			if ( hasOverlayNotification ) {
				collection.focusContainer = overlayNotifications[ overlayNotifications.length - 1 ].container;
				collection.focusContainer.prop( 'tabIndex', -1 );
				focusableElements = collection.focusContainer.find( ':focusable' );
				if ( focusableElements.length ) {
					focusableElements.first().focus();
				} else {
					collection.focusContainer.focus();
				}
			} else if ( collection.previousActiveElement ) {
				$( collection.previousActiveElement ).trigger( 'focus' );
				collection.previousActiveElement = null;
			}

			collection.previousNotifications = notifications;
			collection.previousContainer = collection.container;
			collection.trigger( 'rendered' );
		},

		/**
		 * Constrain focus on focus container.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		constrainFocus: function constrainFocus( event ) {
			var collection = this, focusableElements;

			// Prevent keys from escaping.
			event.stopPropagation();

			if ( 9 !== event.which ) { // Tab key.
				return;
			}

			focusableElements = collection.focusContainer.find( ':focusable' );
			if ( 0 === focusableElements.length ) {
				focusableElements = collection.focusContainer;
			}

			if ( ! $.contains( collection.focusContainer[0], event.target ) || ! $.contains( collection.focusContainer[0], document.activeElement ) ) {
				event.preventDefault();
				focusableElements.first().focus();
			} else if ( focusableElements.last().is( event.target ) && ! event.shiftKey ) {
				event.preventDefault();
				focusableElements.first().focus();
			} else if ( focusableElements.first().is( event.target ) && event.shiftKey ) {
				event.preventDefault();
				focusableElements.last().focus();
			}
		}
	});

	api.Setting = api.Value.extend(/** @lends wp.customize.Setting.prototype */{

		/**
		 * Default params.
		 *
		 * @since 4.9.0
		 * @var {object}
		 */
		defaults: {
			transport: 'refresh',
			dirty: false
		},

		/**
		 * A Customizer Setting.
		 *
		 * A setting is WordPress data (theme mod, option, menu, etc.) that the user can
		 * draft changes to in the Customizer.
		 *
		 * @see PHP class WP_Customize_Setting.
		 *
		 * @constructs wp.customize.Setting
		 * @augments   wp.customize.Value
		 *
		 * @since 3.4.0
		 *
		 * @param {string}  id                          - The setting ID.
		 * @param {*}       value                       - The initial value of the setting.
		 * @param {Object}  [options={}]                - Options.
		 * @param {string}  [options.transport=refresh] - The transport to use for previewing. Supports 'refresh' and 'postMessage'.
		 * @param {boolean} [options.dirty=false]       - Whether the setting should be considered initially dirty.
		 * @param {Object}  [options.previewer]         - The Previewer instance to sync with. Defaults to wp.customize.previewer.
		 */
		initialize: function( id, value, options ) {
			var setting = this, params;
			params = _.extend(
				{ previewer: api.previewer },
				setting.defaults,
				options || {}
			);

			api.Value.prototype.initialize.call( setting, value, params );

			setting.id = id;
			setting._dirty = params.dirty; // The _dirty property is what the Customizer reads from.
			setting.notifications = new api.Notifications();

			// Whenever the setting's value changes, refresh the preview.
			setting.bind( setting.preview );
		},

		/**
		 * Refresh the preview, respective of the setting's refresh policy.
		 *
		 * If the preview hasn't sent a keep-alive message and is likely
		 * disconnected by having navigated to a non-allowed URL, then the
		 * refresh transport will be forced when postMessage is the transport.
		 * Note that postMessage does not throw an error when the recipient window
		 * fails to match the origin window, so using try/catch around the
		 * previewer.send() call to then fallback to refresh will not work.
		 *
		 * @since 3.4.0
		 * @access public
		 *
		 * @return {void}
		 */
		preview: function() {
			var setting = this, transport;
			transport = setting.transport;

			if ( 'postMessage' === transport && ! api.state( 'previewerAlive' ).get() ) {
				transport = 'refresh';
			}

			if ( 'postMessage' === transport ) {
				setting.previewer.send( 'setting', [ setting.id, setting() ] );
			} else if ( 'refresh' === transport ) {
				setting.previewer.refresh();
			}
		},

		/**
		 * Find controls associated with this setting.
		 *
		 * @since 4.6.0
		 * @return {wp.customize.Control[]} Controls associated with setting.
		 */
		findControls: function() {
			var setting = this, controls = [];
			api.control.each( function( control ) {
				_.each( control.settings, function( controlSetting ) {
					if ( controlSetting.id === setting.id ) {
						controls.push( control );
					}
				} );
			} );
			return controls;
		}
	});

	/**
	 * Current change count.
	 *
	 * @alias wp.customize._latestRevision
	 *
	 * @since 4.7.0
	 * @type {number}
	 * @protected
	 */
	api._latestRevision = 0;

	/**
	 * Last revision that was saved.
	 *
	 * @alias wp.customize._lastSavedRevision
	 *
	 * @since 4.7.0
	 * @type {number}
	 * @protected
	 */
	api._lastSavedRevision = 0;

	/**
	 * Latest revisions associated with the updated setting.
	 *
	 * @alias wp.customize._latestSettingRevisions
	 *
	 * @since 4.7.0
	 * @type {object}
	 * @protected
	 */
	api._latestSettingRevisions = {};

	/*
	 * Keep track of the revision associated with each updated setting so that
	 * requestChangesetUpdate knows which dirty settings to include. Also, once
	 * ready is triggered and all initial settings have been added, increment
	 * revision for each newly-created initially-dirty setting so that it will
	 * also be included in changeset update requests.
	 */
	api.bind( 'change', function incrementChangedSettingRevision( setting ) {
		api._latestRevision += 1;
		api._latestSettingRevisions[ setting.id ] = api._latestRevision;
	} );
	api.bind( 'ready', function() {
		api.bind( 'add', function incrementCreatedSettingRevision( setting ) {
			if ( setting._dirty ) {
				api._latestRevision += 1;
				api._latestSettingRevisions[ setting.id ] = api._latestRevision;
			}
		} );
	} );

	/**
	 * Get the dirty setting values.
	 *
	 * @alias wp.customize.dirtyValues
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param {Object} [options] Options.
	 * @param {boolean} [options.unsaved=false] Whether only values not saved yet into a changeset will be returned (differential changes).
	 * @return {Object} Dirty setting values.
	 */
	api.dirtyValues = function dirtyValues( options ) {
		var values = {};
		api.each( function( setting ) {
			var settingRevision;

			if ( ! setting._dirty ) {
				return;
			}

			settingRevision = api._latestSettingRevisions[ setting.id ];

			// Skip including settings that have already been included in the changeset, if only requesting unsaved.
			if ( api.state( 'changesetStatus' ).get() && ( options && options.unsaved ) && ( _.isUndefined( settingRevision ) || settingRevision <= api._lastSavedRevision ) ) {
				return;
			}

			values[ setting.id ] = setting.get();
		} );
		return values;
	};

	/**
	 * Request updates to the changeset.
	 *
	 * @alias wp.customize.requestChangesetUpdate
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param {Object}  [changes] - Mapping of setting IDs to setting params each normally including a value property, or mapping to null.
	 *                             If not provided, then the changes will still be obtained from unsaved dirty settings.
	 * @param {Object}  [args] - Additional options for the save request.
	 * @param {boolean} [args.autosave=false] - Whether changes will be stored in autosave revision if the changeset has been promoted from an auto-draft.
	 * @param {boolean} [args.force=false] - Send request to update even when there are no changes to submit. This can be used to request the latest status of the changeset on the server.
	 * @param {string}  [args.title] - Title to update in the changeset. Optional.
	 * @param {string}  [args.date] - Date to update in the changeset. Optional.
	 * @return {jQuery.Promise} Promise resolving with the response data.
	 */
	api.requestChangesetUpdate = function requestChangesetUpdate( changes, args ) {
		var deferred, request, submittedChanges = {}, data, submittedArgs;
		deferred = new $.Deferred();

		// Prevent attempting changeset update while request is being made.
		if ( 0 !== api.state( 'processing' ).get() ) {
			deferred.reject( 'already_processing' );
			return deferred.promise();
		}

		submittedArgs = _.extend( {
			title: null,
			date: null,
			autosave: false,
			force: false
		}, args );

		if ( changes ) {
			_.extend( submittedChanges, changes );
		}

		// Ensure all revised settings (changes pending save) are also included, but not if marked for deletion in changes.
		_.each( api.dirtyValues( { unsaved: true } ), function( dirtyValue, settingId ) {
			if ( ! changes || null !== changes[ settingId ] ) {
				submittedChanges[ settingId ] = _.extend(
					{},
					submittedChanges[ settingId ] || {},
					{ value: dirtyValue }
				);
			}
		} );

		// Allow plugins to attach additional params to the settings.
		api.trigger( 'changeset-save', submittedChanges, submittedArgs );

		// Short-circuit when there are no pending changes.
		if ( ! submittedArgs.force && _.isEmpty( submittedChanges ) && null === submittedArgs.title && null === submittedArgs.date ) {
			deferred.resolve( {} );
			return deferred.promise();
		}

		// A status would cause a revision to be made, and for this wp.customize.previewer.save() should be used.
		// Status is also disallowed for revisions regardless.
		if ( submittedArgs.status ) {
			return deferred.reject( { code: 'illegal_status_in_changeset_update' } ).promise();
		}

		// Dates not beung allowed for revisions are is a technical limitation of post revisions.
		if ( submittedArgs.date && submittedArgs.autosave ) {
			return deferred.reject( { code: 'illegal_autosave_with_date_gmt' } ).promise();
		}

		// Make sure that publishing a changeset waits for all changeset update requests to complete.
		api.state( 'processing' ).set( api.state( 'processing' ).get() + 1 );
		deferred.always( function() {
			api.state( 'processing' ).set( api.state( 'processing' ).get() - 1 );
		} );

		// Ensure that if any plugins add data to save requests by extending query() that they get included here.
		data = api.previewer.query( { excludeCustomizedSaved: true } );
		delete data.customized; // Being sent in customize_changeset_data instead.
		_.extend( data, {
			nonce: api.settings.nonce.save,
			customize_theme: api.settings.theme.stylesheet,
			customize_changeset_data: JSON.stringify( submittedChanges )
		} );
		if ( null !== submittedArgs.title ) {
			data.customize_changeset_title = submittedArgs.title;
		}
		if ( null !== submittedArgs.date ) {
			data.customize_changeset_date = submittedArgs.date;
		}
		if ( false !== submittedArgs.autosave ) {
			data.customize_changeset_autosave = 'true';
		}

		// Allow plugins to modify the params included with the save request.
		api.trigger( 'save-request-params', data );

		request = wp.ajax.post( 'customize_save', data );

		request.done( function requestChangesetUpdateDone( data ) {
			var savedChangesetValues = {};

			// Ensure that all settings updated subsequently will be included in the next changeset update request.
			api._lastSavedRevision = Math.max( api._latestRevision, api._lastSavedRevision );

			api.state( 'changesetStatus' ).set( data.changeset_status );

			if ( data.changeset_date ) {
				api.state( 'changesetDate' ).set( data.changeset_date );
			}

			deferred.resolve( data );
			api.trigger( 'changeset-saved', data );

			if ( data.setting_validities ) {
				_.each( data.setting_validities, function( validity, settingId ) {
					if ( true === validity && _.isObject( submittedChanges[ settingId ] ) && ! _.isUndefined( submittedChanges[ settingId ].value ) ) {
						savedChangesetValues[ settingId ] = submittedChanges[ settingId ].value;
					}
				} );
			}

			api.previewer.send( 'changeset-saved', _.extend( {}, data, { saved_changeset_values: savedChangesetValues } ) );
		} );
		request.fail( function requestChangesetUpdateFail( data ) {
			deferred.reject( data );
			api.trigger( 'changeset-error', data );
		} );
		request.always( function( data ) {
			if ( data.setting_validities ) {
				api._handleSettingValidities( {
					settingValidities: data.setting_validities
				} );
			}
		} );

		return deferred.promise();
	};

	/**
	 * Watch all changes to Value properties, and bubble changes to parent Values instance
	 *
	 * @alias wp.customize.utils.bubbleChildValueChanges
	 *
	 * @since 4.1.0
	 *
	 * @param {wp.customize.Class} instance
	 * @param {Array}              properties  The names of the Value instances to watch.
	 */
	api.utils.bubbleChildValueChanges = function ( instance, properties ) {
		$.each( properties, function ( i, key ) {
			instance[ key ].bind( function ( to, from ) {
				if ( instance.parent && to !== from ) {
					instance.parent.trigger( 'change', instance );
				}
			} );
		} );
	};

	/**
	 * Expand a panel, section, or control and focus on the first focusable element.
	 *
	 * @alias wp.customize~focus
	 *
	 * @since 4.1.0
	 *
	 * @param {Object}   [params]
	 * @param {Function} [params.completeCallback]
	 */
	focus = function ( params ) {
		var construct, completeCallback, focus, focusElement, sections;
		construct = this;
		params = params || {};
		focus = function () {
			// If a child section is currently expanded, collapse it.
			if ( construct.extended( api.Panel ) ) {
				sections = construct.sections();
				if ( 1 < sections.length ) {
					sections.forEach( function ( section ) {
						if ( section.expanded() ) {
							section.collapse();
						}
					} );
				}
			}

			var focusContainer;
			if ( ( construct.extended( api.Panel ) || construct.extended( api.Section ) ) && construct.expanded && construct.expanded() ) {
				focusContainer = construct.contentContainer;
			} else {
				focusContainer = construct.container;
			}

			focusElement = focusContainer.find( '.control-focus:first' );
			if ( 0 === focusElement.length ) {
				// Note that we can't use :focusable due to a jQuery UI issue. See: https://github.com/jquery/jquery-ui/pull/1583
				focusElement = focusContainer.find( 'input, select, textarea, button, object, a[href], [tabindex]' ).filter( ':visible' ).first();
			}
			focusElement.focus();
		};
		if ( params.completeCallback ) {
			completeCallback = params.completeCallback;
			params.completeCallback = function () {
				focus();
				completeCallback();
			};
		} else {
			params.completeCallback = focus;
		}

		api.state( 'paneVisible' ).set( true );
		if ( construct.expand ) {
			construct.expand( params );
		} else {
			params.completeCallback();
		}
	};

	/**
	 * Stable sort for Panels, Sections, and Controls.
	 *
	 * If a.priority() === b.priority(), then sort by their respective params.instanceNumber.
	 *
	 * @alias wp.customize.utils.prioritySort
	 *
	 * @since 4.1.0
	 *
	 * @param {(wp.customize.Panel|wp.customize.Section|wp.customize.Control)} a
	 * @param {(wp.customize.Panel|wp.customize.Section|wp.customize.Control)} b
	 * @return {number}
	 */
	api.utils.prioritySort = function ( a, b ) {
		if ( a.priority() === b.priority() && typeof a.params.instanceNumber === 'number' && typeof b.params.instanceNumber === 'number' ) {
			return a.params.instanceNumber - b.params.instanceNumber;
		} else {
			return a.priority() - b.priority();
		}
	};

	/**
	 * Return whether the supplied Event object is for a keydown event but not the Enter key.
	 *
	 * @alias wp.customize.utils.isKeydownButNotEnterEvent
	 *
	 * @since 4.1.0
	 *
	 * @param {jQuery.Event} event
	 * @return {boolean}
	 */
	api.utils.isKeydownButNotEnterEvent = function ( event ) {
		return ( 'keydown' === event.type && 13 !== event.which );
	};

	/**
	 * Return whether the two lists of elements are the same and are in the same order.
	 *
	 * @alias wp.customize.utils.areElementListsEqual
	 *
	 * @since 4.1.0
	 *
	 * @param {Array|jQuery} listA
	 * @param {Array|jQuery} listB
	 * @return {boolean}
	 */
	api.utils.areElementListsEqual = function ( listA, listB ) {
		var equal = (
			listA.length === listB.length && // If lists are different lengths, then naturally they are not equal.
			-1 === _.indexOf( _.map(         // Are there any false values in the list returned by map?
				_.zip( listA, listB ),       // Pair up each element between the two lists.
				function ( pair ) {
					return $( pair[0] ).is( pair[1] ); // Compare to see if each pair is equal.
				}
			), false ) // Check for presence of false in map's return value.
		);
		return equal;
	};

	/**
	 * Highlight the existence of a button.
	 *
	 * This function reminds the user of a button represented by the specified
	 * UI element, after an optional delay. If the user focuses the element
	 * before the delay passes, the reminder is canceled.
	 *
	 * @alias wp.customize.utils.highlightButton
	 *
	 * @since 4.9.0
	 *
	 * @param {jQuery} button - The element to highlight.
	 * @param {Object} [options] - Options.
	 * @param {number} [options.delay=0] - Delay in milliseconds.
	 * @param {jQuery} [options.focusTarget] - A target for user focus that defaults to the highlighted element.
	 *                                         If the user focuses the target before the delay passes, the reminder
	 *                                         is canceled. This option exists to accommodate compound buttons
	 *                                         containing auxiliary UI, such as the Publish button augmented with a
	 *                                         Settings button.
	 * @return {Function} An idempotent function that cancels the reminder.
	 */
	api.utils.highlightButton = function highlightButton( button, options ) {
		var animationClass = 'button-see-me',
			canceled = false,
			params;

		params = _.extend(
			{
				delay: 0,
				focusTarget: button
			},
			options
		);

		function cancelReminder() {
			canceled = true;
		}

		params.focusTarget.on( 'focusin', cancelReminder );
		setTimeout( function() {
			params.focusTarget.off( 'focusin', cancelReminder );

			if ( ! canceled ) {
				button.addClass( animationClass );
				button.one( 'animationend', function() {
					/*
					 * Remove animation class to avoid situations in Customizer where
					 * DOM nodes are moved (re-inserted) and the animation repeats.
					 */
					button.removeClass( animationClass );
				} );
			}
		}, params.delay );

		return cancelReminder;
	};

	/**
	 * Get current timestamp adjusted for server clock time.
	 *
	 * Same functionality as the `current_time( 'mysql', false )` function in PHP.
	 *
	 * @alias wp.customize.utils.getCurrentTimestamp
	 *
	 * @since 4.9.0
	 *
	 * @return {number} Current timestamp.
	 */
	api.utils.getCurrentTimestamp = function getCurrentTimestamp() {
		var currentDate, currentClientTimestamp, timestampDifferential;
		currentClientTimestamp = _.now();
		currentDate = new Date( api.settings.initialServerDate.replace( /-/g, '/' ) );
		timestampDifferential = currentClientTimestamp - api.settings.initialClientTimestamp;
		timestampDifferential += api.settings.initialClientTimestamp - api.settings.initialServerTimestamp;
		currentDate.setTime( currentDate.getTime() + timestampDifferential );
		return currentDate.getTime();
	};

	/**
	 * Get remaining time of when the date is set.
	 *
	 * @alias wp.customize.utils.getRemainingTime
	 *
	 * @since 4.9.0
	 *
	 * @param {string|number|Date} datetime - Date time or timestamp of the future date.
	 * @return {number} remainingTime - Remaining time in milliseconds.
	 */
	api.utils.getRemainingTime = function getRemainingTime( datetime ) {
		var millisecondsDivider = 1000, remainingTime, timestamp;
		if ( datetime instanceof Date ) {
			timestamp = datetime.getTime();
		} else if ( 'string' === typeof datetime ) {
			timestamp = ( new Date( datetime.replace( /-/g, '/' ) ) ).getTime();
		} else {
			timestamp = datetime;
		}

		remainingTime = timestamp - api.utils.getCurrentTimestamp();
		remainingTime = Math.ceil( remainingTime / millisecondsDivider );
		return remainingTime;
	};

	/**
	 * Return browser supported `transitionend` event name.
	 *
	 * @since 4.7.0
	 *
	 * @ignore
	 *
	 * @return {string|null} Normalized `transitionend` event name or null if CSS transitions are not supported.
	 */
	normalizedTransitionendEventName = (function () {
		var el, transitions, prop;
		el = document.createElement( 'div' );
		transitions = {
			'transition'      : 'transitionend',
			'OTransition'     : 'oTransitionEnd',
			'MozTransition'   : 'transitionend',
			'WebkitTransition': 'webkitTransitionEnd'
		};
		prop = _.find( _.keys( transitions ), function( prop ) {
			return ! _.isUndefined( el.style[ prop ] );
		} );
		if ( prop ) {
			return transitions[ prop ];
		} else {
			return null;
		}
	})();

	Container = api.Class.extend(/** @lends wp.customize~Container.prototype */{
		defaultActiveArguments: { duration: 'fast', completeCallback: $.noop },
		defaultExpandedArguments: { duration: 'fast', completeCallback: $.noop },
		containerType: 'container',
		defaults: {
			title: '',
			description: '',
			priority: 100,
			type: 'default',
			content: null,
			active: true,
			instanceNumber: null
		},

		/**
		 * Base class for Panel and Section.
		 *
		 * @constructs wp.customize~Container
		 * @augments   wp.customize.Class
		 *
		 * @since 4.1.0
		 *
		 * @borrows wp.customize~focus as focus
		 *
		 * @param {string}  id - The ID for the container.
		 * @param {Object}  options - Object containing one property: params.
		 * @param {string}  options.title - Title shown when panel is collapsed and expanded.
		 * @param {string}  [options.description] - Description shown at the top of the panel.
		 * @param {number}  [options.priority=100] - The sort priority for the panel.
		 * @param {string}  [options.templateId] - Template selector for container.
		 * @param {string}  [options.type=default] - The type of the panel. See wp.customize.panelConstructor.
		 * @param {string}  [options.content] - The markup to be used for the panel container. If empty, a JS template is used.
		 * @param {boolean} [options.active=true] - Whether the panel is active or not.
		 * @param {Object}  [options.params] - Deprecated wrapper for the above properties.
		 */
		initialize: function ( id, options ) {
			var container = this;
			container.id = id;

			if ( ! Container.instanceCounter ) {
				Container.instanceCounter = 0;
			}
			Container.instanceCounter++;

			$.extend( container, {
				params: _.defaults(
					options.params || options, // Passing the params is deprecated.
					container.defaults
				)
			} );
			if ( ! container.params.instanceNumber ) {
				container.params.instanceNumber = Container.instanceCounter;
			}
			container.notifications = new api.Notifications();
			container.templateSelector = container.params.templateId || 'customize-' + container.containerType + '-' + container.params.type;
			container.container = $( container.params.content );
			if ( 0 === container.container.length ) {
				container.container = $( container.getContainer() );
			}
			container.headContainer = container.container;
			container.contentContainer = container.getContent();
			container.container = container.container.add( container.contentContainer );

			container.deferred = {
				embedded: new $.Deferred()
			};
			container.priority = new api.Value();
			container.active = new api.Value();
			container.activeArgumentsQueue = [];
			container.expanded = new api.Value();
			container.expandedArgumentsQueue = [];

			container.active.bind( function ( active ) {
				var args = container.activeArgumentsQueue.shift();
				args = $.extend( {}, container.defaultActiveArguments, args );
				active = ( active && container.isContextuallyActive() );
				container.onChangeActive( active, args );
			});
			container.expanded.bind( function ( expanded ) {
				var args = container.expandedArgumentsQueue.shift();
				args = $.extend( {}, container.defaultExpandedArguments, args );
				container.onChangeExpanded( expanded, args );
			});

			container.deferred.embedded.done( function () {
				container.setupNotifications();
				container.attachEvents();
			});

			api.utils.bubbleChildValueChanges( container, [ 'priority', 'active' ] );

			container.priority.set( container.params.priority );
			container.active.set( container.params.active );
			container.expanded.set( false );
		},

		/**
		 * Get the element that will contain the notifications.
		 *
		 * @since 4.9.0
		 * @return {jQuery} Notification container element.
		 */
		getNotificationsContainerElement: function() {
			var container = this;
			return container.contentContainer.find( '.customize-control-notifications-container:first' );
		},

		/**
		 * Set up notifications.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		setupNotifications: function() {
			var container = this, renderNotifications;
			container.notifications.container = container.getNotificationsContainerElement();

			// Render notifications when they change and when the construct is expanded.
			renderNotifications = function() {
				if ( container.expanded.get() ) {
					container.notifications.render();
				}
			};
			container.expanded.bind( renderNotifications );
			renderNotifications();
			container.notifications.bind( 'change', _.debounce( renderNotifications ) );
		},

		/**
		 * @since 4.1.0
		 *
		 * @abstract
		 */
		ready: function() {},

		/**
		 * Get the child models associated with this parent, sorting them by their priority Value.
		 *
		 * @since 4.1.0
		 *
		 * @param {string} parentType
		 * @param {string} childType
		 * @return {Array}
		 */
		_children: function ( parentType, childType ) {
			var parent = this,
				children = [];
			api[ childType ].each( function ( child ) {
				if ( child[ parentType ].get() === parent.id ) {
					children.push( child );
				}
			} );
			children.sort( api.utils.prioritySort );
			return children;
		},

		/**
		 * To override by subclass, to return whether the container has active children.
		 *
		 * @since 4.1.0
		 *
		 * @abstract
		 */
		isContextuallyActive: function () {
			throw new Error( 'Container.isContextuallyActive() must be overridden in a subclass.' );
		},

		/**
		 * Active state change handler.
		 *
		 * Shows the container if it is active, hides it if not.
		 *
		 * To override by subclass, update the container's UI to reflect the provided active state.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean}  active - The active state to transiution to.
		 * @param {Object}   [args] - Args.
		 * @param {Object}   [args.duration] - The duration for the slideUp/slideDown animation.
		 * @param {boolean}  [args.unchanged] - Whether the state is already known to not be changed, and so short-circuit with calling completeCallback early.
		 * @param {Function} [args.completeCallback] - Function to call when the slideUp/slideDown has completed.
		 */
		onChangeActive: function( active, args ) {
			var construct = this,
				headContainer = construct.headContainer,
				duration, expandedOtherPanel;

			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			duration = ( 'resolved' === api.previewer.deferred.active.state() ? args.duration : 0 );

			if ( construct.extended( api.Panel ) ) {
				// If this is a panel is not currently expanded but another panel is expanded, do not animate.
				api.panel.each(function ( panel ) {
					if ( panel !== construct && panel.expanded() ) {
						expandedOtherPanel = panel;
						duration = 0;
					}
				});

				// Collapse any expanded sections inside of this panel first before deactivating.
				if ( ! active ) {
					_.each( construct.sections(), function( section ) {
						section.collapse( { duration: 0 } );
					} );
				}
			}

			if ( ! $.contains( document, headContainer.get( 0 ) ) ) {
				// If the element is not in the DOM, then jQuery.fn.slideUp() does nothing.
				// In this case, a hard toggle is required instead.
				headContainer.toggle( active );
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			} else if ( active ) {
				headContainer.slideDown( duration, args.completeCallback );
			} else {
				if ( construct.expanded() ) {
					construct.collapse({
						duration: duration,
						completeCallback: function() {
							headContainer.slideUp( duration, args.completeCallback );
						}
					});
				} else {
					headContainer.slideUp( duration, args.completeCallback );
				}
			}
		},

		/**
		 * @since 4.1.0
		 *
		 * @param {boolean} active
		 * @param {Object}  [params]
		 * @return {boolean} False if state already applied.
		 */
		_toggleActive: function ( active, params ) {
			var self = this;
			params = params || {};
			if ( ( active && this.active.get() ) || ( ! active && ! this.active.get() ) ) {
				params.unchanged = true;
				self.onChangeActive( self.active.get(), params );
				return false;
			} else {
				params.unchanged = false;
				this.activeArgumentsQueue.push( params );
				this.active.set( active );
				return true;
			}
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already active.
		 */
		activate: function ( params ) {
			return this._toggleActive( true, params );
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already inactive.
		 */
		deactivate: function ( params ) {
			return this._toggleActive( false, params );
		},

		/**
		 * To override by subclass, update the container's UI to reflect the provided active state.
		 * @abstract
		 */
		onChangeExpanded: function () {
			throw new Error( 'Must override with subclass.' );
		},

		/**
		 * Handle the toggle logic for expand/collapse.
		 *
		 * @param {boolean}  expanded - The new state to apply.
		 * @param {Object}   [params] - Object containing options for expand/collapse.
		 * @param {Function} [params.completeCallback] - Function to call when expansion/collapse is complete.
		 * @return {boolean} False if state already applied or active state is false.
		 */
		_toggleExpanded: function( expanded, params ) {
			var instance = this, previousCompleteCallback;
			params = params || {};
			previousCompleteCallback = params.completeCallback;

			// Short-circuit expand() if the instance is not active.
			if ( expanded && ! instance.active() ) {
				return false;
			}

			api.state( 'paneVisible' ).set( true );
			params.completeCallback = function() {
				if ( previousCompleteCallback ) {
					previousCompleteCallback.apply( instance, arguments );
				}
				if ( expanded ) {
					instance.container.trigger( 'expanded' );
				} else {
					instance.container.trigger( 'collapsed' );
				}
			};
			if ( ( expanded && instance.expanded.get() ) || ( ! expanded && ! instance.expanded.get() ) ) {
				params.unchanged = true;
				instance.onChangeExpanded( instance.expanded.get(), params );
				return false;
			} else {
				params.unchanged = false;
				instance.expandedArgumentsQueue.push( params );
				instance.expanded.set( expanded );
				return true;
			}
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already expanded or if inactive.
		 */
		expand: function ( params ) {
			return this._toggleExpanded( true, params );
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already collapsed.
		 */
		collapse: function ( params ) {
			return this._toggleExpanded( false, params );
		},

		/**
		 * Animate container state change if transitions are supported by the browser.
		 *
		 * @since 4.7.0
		 * @private
		 *
		 * @param {function} completeCallback Function to be called after transition is completed.
		 * @return {void}
		 */
		_animateChangeExpanded: function( completeCallback ) {
			// Return if CSS transitions are not supported or if reduced motion is enabled.
			if ( ! normalizedTransitionendEventName || isReducedMotion ) {
				// Schedule the callback until the next tick to prevent focus loss.
				_.defer( function () {
					if ( completeCallback ) {
						completeCallback();
					}
				} );
				return;
			}

			var construct = this,
				content = construct.contentContainer,
				overlay = content.closest( '.wp-full-overlay' ),
				elements, transitionEndCallback, transitionParentPane;

			// Determine set of elements that are affected by the animation.
			elements = overlay.add( content );

			if ( ! construct.panel || '' === construct.panel() ) {
				transitionParentPane = true;
			} else if ( api.panel( construct.panel() ).contentContainer.hasClass( 'skip-transition' ) ) {
				transitionParentPane = true;
			} else {
				transitionParentPane = false;
			}
			if ( transitionParentPane ) {
				elements = elements.add( '#customize-info, .customize-pane-parent' );
			}

			// Handle `transitionEnd` event.
			transitionEndCallback = function( e ) {
				if ( 2 !== e.eventPhase || ! $( e.target ).is( content ) ) {
					return;
				}
				content.off( normalizedTransitionendEventName, transitionEndCallback );
				elements.removeClass( 'busy' );
				if ( completeCallback ) {
					completeCallback();
				}
			};
			content.on( normalizedTransitionendEventName, transitionEndCallback );
			elements.addClass( 'busy' );

			// Prevent screen flicker when pane has been scrolled before expanding.
			_.defer( function() {
				var container = content.closest( '.wp-full-overlay-sidebar-content' ),
					currentScrollTop = container.scrollTop(),
					previousScrollTop = content.data( 'previous-scrollTop' ) || 0,
					expanded = construct.expanded();

				if ( expanded && 0 < currentScrollTop ) {
					content.css( 'top', currentScrollTop + 'px' );
					content.data( 'previous-scrollTop', currentScrollTop );
				} else if ( ! expanded && 0 < currentScrollTop + previousScrollTop ) {
					content.css( 'top', previousScrollTop - currentScrollTop + 'px' );
					container.scrollTop( previousScrollTop );
				}
			} );
		},

		/*
		 * is documented using @borrows in the constructor.
		 */
		focus: focus,

		/**
		 * Return the container html, generated from its JS template, if it exists.
		 *
		 * @since 4.3.0
		 */
		getContainer: function () {
			var template,
				container = this;

			if ( 0 !== $( '#tmpl-' + container.templateSelector ).length ) {
				template = wp.template( container.templateSelector );
			} else {
				template = wp.template( 'customize-' + container.containerType + '-default' );
			}
			if ( template && container.container ) {
				return template( _.extend(
					{ id: container.id },
					container.params
				) ).toString().trim();
			}

			return '<li></li>';
		},

		/**
		 * Find content element which is displayed when the section is expanded.
		 *
		 * After a construct is initialized, the return value will be available via the `contentContainer` property.
		 * By default the element will be related it to the parent container with `aria-owns` and detached.
		 * Custom panels and sections (such as the `NewMenuSection`) that do not have a sliding pane should
		 * just return the content element without needing to add the `aria-owns` element or detach it from
		 * the container. Such non-sliding pane custom sections also need to override the `onChangeExpanded`
		 * method to handle animating the panel/section into and out of view.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @return {jQuery} Detached content element.
		 */
		getContent: function() {
			var construct = this,
				container = construct.container,
				content = container.find( '.accordion-section-content, .control-panel-content' ).first(),
				contentId = 'sub-' + container.attr( 'id' ),
				ownedElements = contentId,
				alreadyOwnedElements = container.attr( 'aria-owns' );

			if ( alreadyOwnedElements ) {
				ownedElements = ownedElements + ' ' + alreadyOwnedElements;
			}
			container.attr( 'aria-owns', ownedElements );

			return content.detach().attr( {
				'id': contentId,
				'class': 'customize-pane-child ' + content.attr( 'class' ) + ' ' + container.attr( 'class' )
			} );
		}
	});

	api.Section = Container.extend(/** @lends wp.customize.Section.prototype */{
		containerType: 'section',
		containerParent: '#customize-theme-controls',
		containerPaneParent: '.customize-pane-parent',
		defaults: {
			title: '',
			description: '',
			priority: 100,
			type: 'default',
			content: null,
			active: true,
			instanceNumber: null,
			panel: null,
			customizeAction: ''
		},

		/**
		 * @constructs wp.customize.Section
		 * @augments   wp.customize~Container
		 *
		 * @since 4.1.0
		 *
		 * @param {string}  id - The ID for the section.
		 * @param {Object}  options - Options.
		 * @param {string}  options.title - Title shown when section is collapsed and expanded.
		 * @param {string}  [options.description] - Description shown at the top of the section.
		 * @param {number}  [options.priority=100] - The sort priority for the section.
		 * @param {string}  [options.type=default] - The type of the section. See wp.customize.sectionConstructor.
		 * @param {string}  [options.content] - The markup to be used for the section container. If empty, a JS template is used.
		 * @param {boolean} [options.active=true] - Whether the section is active or not.
		 * @param {string}  options.panel - The ID for the panel this section is associated with.
		 * @param {string}  [options.customizeAction] - Additional context information shown before the section title when expanded.
		 * @param {Object}  [options.params] - Deprecated wrapper for the above properties.
		 */
		initialize: function ( id, options ) {
			var section = this, params;
			params = options.params || options;

			// Look up the type if one was not supplied.
			if ( ! params.type ) {
				_.find( api.sectionConstructor, function( Constructor, type ) {
					if ( Constructor === section.constructor ) {
						params.type = type;
						return true;
					}
					return false;
				} );
			}

			Container.prototype.initialize.call( section, id, params );

			section.id = id;
			section.panel = new api.Value();
			section.panel.bind( function ( id ) {
				$( section.headContainer ).toggleClass( 'control-subsection', !! id );
			});
			section.panel.set( section.params.panel || '' );
			api.utils.bubbleChildValueChanges( section, [ 'panel' ] );

			section.embed();
			section.deferred.embedded.done( function () {
				section.ready();
			});
		},

		/**
		 * Embed the container in the DOM when any parent panel is ready.
		 *
		 * @since 4.1.0
		 */
		embed: function () {
			var inject,
				section = this;

			section.containerParent = api.ensure( section.containerParent );

			// Watch for changes to the panel state.
			inject = function ( panelId ) {
				var parentContainer;
				if ( panelId ) {
					// The panel has been supplied, so wait until the panel object is registered.
					api.panel( panelId, function ( panel ) {
						// The panel has been registered, wait for it to become ready/initialized.
						panel.deferred.embedded.done( function () {
							parentContainer = panel.contentContainer;
							if ( ! section.headContainer.parent().is( parentContainer ) ) {
								parentContainer.append( section.headContainer );
							}
							if ( ! section.contentContainer.parent().is( section.headContainer ) ) {
								section.containerParent.append( section.contentContainer );
							}
							section.deferred.embedded.resolve();
						});
					} );
				} else {
					// There is no panel, so embed the section in the root of the customizer.
					parentContainer = api.ensure( section.containerPaneParent );
					if ( ! section.headContainer.parent().is( parentContainer ) ) {
						parentContainer.append( section.headContainer );
					}
					if ( ! section.contentContainer.parent().is( section.headContainer ) ) {
						section.containerParent.append( section.contentContainer );
					}
					section.deferred.embedded.resolve();
				}
			};
			section.panel.bind( inject );
			inject( section.panel.get() ); // Since a section may never get a panel, assume that it won't ever get one.
		},

		/**
		 * Add behaviors for the accordion section.
		 *
		 * @since 4.1.0
		 */
		attachEvents: function () {
			var meta, content, section = this;

			if ( section.container.hasClass( 'cannot-expand' ) ) {
				return;
			}

			// Expand/Collapse accordion sections on click.
			section.container.find( '.accordion-section-title button, .customize-section-back' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.

				if ( section.expanded() ) {
					section.collapse();
				} else {
					section.expand();
				}
			});

			// This is very similar to what is found for api.Panel.attachEvents().
			section.container.find( '.customize-section-title .customize-help-toggle' ).on( 'click', function() {

				meta = section.container.find( '.section-meta' );
				if ( meta.hasClass( 'cannot-expand' ) ) {
					return;
				}
				content = meta.find( '.customize-section-description:first' );
				content.toggleClass( 'open' );
				content.slideToggle( section.defaultExpandedArguments.duration, function() {
					content.trigger( 'toggled' );
				} );
				$( this ).attr( 'aria-expanded', function( i, attr ) {
					return 'true' === attr ? 'false' : 'true';
				});
			});
		},

		/**
		 * Return whether this section has any active controls.
		 *
		 * @since 4.1.0
		 *
		 * @return {boolean}
		 */
		isContextuallyActive: function () {
			var section = this,
				controls = section.controls(),
				activeCount = 0;
			_( controls ).each( function ( control ) {
				if ( control.active() ) {
					activeCount += 1;
				}
			} );
			return ( activeCount !== 0 );
		},

		/**
		 * Get the controls that are associated with this section, sorted by their priority Value.
		 *
		 * @since 4.1.0
		 *
		 * @return {Array}
		 */
		controls: function () {
			return this._children( 'section', 'control' );
		},

		/**
		 * Update UI to reflect expanded state.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean} expanded
		 * @param {Object}  args
		 */
		onChangeExpanded: function ( expanded, args ) {
			var section = this,
				container = section.headContainer.closest( '.wp-full-overlay-sidebar-content' ),
				content = section.contentContainer,
				overlay = section.headContainer.closest( '.wp-full-overlay' ),
				backBtn = content.find( '.customize-section-back' ),
				sectionTitle = section.headContainer.find( '.accordion-section-title button' ).first(),
				expand, panel;

			if ( expanded && ! content.hasClass( 'open' ) ) {

				if ( args.unchanged ) {
					expand = args.completeCallback;
				} else {
					expand = function() {
						section._animateChangeExpanded( function() {
							backBtn.trigger( 'focus' );
							content.css( 'top', '' );
							container.scrollTop( 0 );

							if ( args.completeCallback ) {
								args.completeCallback();
							}
						} );

						content.addClass( 'open' );
						overlay.addClass( 'section-open' );
						api.state( 'expandedSection' ).set( section );
					}.bind( this );
				}

				if ( ! args.allowMultiple ) {
					api.section.each( function ( otherSection ) {
						if ( otherSection !== section ) {
							otherSection.collapse( { duration: args.duration } );
						}
					});
				}

				if ( section.panel() ) {
					api.panel( section.panel() ).expand({
						duration: args.duration,
						completeCallback: expand
					});
				} else {
					if ( ! args.allowMultiple ) {
						api.panel.each( function( panel ) {
							panel.collapse();
						});
					}
					expand();
				}

			} else if ( ! expanded && content.hasClass( 'open' ) ) {
				if ( section.panel() ) {
					panel = api.panel( section.panel() );
					if ( panel.contentContainer.hasClass( 'skip-transition' ) ) {
						panel.collapse();
					}
				}
				section._animateChangeExpanded( function() {

					sectionTitle.trigger( 'focus' );
					content.css( 'top', '' );

					if ( args.completeCallback ) {
						args.completeCallback();
					}
				} );

				content.removeClass( 'open' );
				overlay.removeClass( 'section-open' );
				if ( section === api.state( 'expandedSection' ).get() ) {
					api.state( 'expandedSection' ).set( false );
				}

			} else {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			}
		}
	});

	api.ThemesSection = api.Section.extend(/** @lends wp.customize.ThemesSection.prototype */{
		currentTheme: '',
		overlay: '',
		template: '',
		screenshotQueue: null,
		$window: null,
		$body: null,
		loaded: 0,
		loading: false,
		fullyLoaded: false,
		term: '',
		tags: '',
		nextTerm: '',
		nextTags: '',
		filtersHeight: 0,
		headerContainer: null,
		updateCountDebounced: null,

		/**
		 * wp.customize.ThemesSection
		 *
		 * Custom section for themes that loads themes by category, and also
		 * handles the theme-details view rendering and navigation.
		 *
		 * @constructs wp.customize.ThemesSection
		 * @augments   wp.customize.Section
		 *
		 * @since 4.9.0
		 *
		 * @param {string} id - ID.
		 * @param {Object} options - Options.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var section = this;
			section.headerContainer = $();
			section.$window = $( window );
			section.$body = $( document.body );
			api.Section.prototype.initialize.call( section, id, options );
			section.updateCountDebounced = _.debounce( section.updateCount, 500 );
		},

		/**
		 * Embed the section in the DOM when the themes panel is ready.
		 *
		 * Insert the section before the themes container. Assume that a themes section is within a panel, but not necessarily the themes panel.
		 *
		 * @since 4.9.0
		 */
		embed: function() {
			var inject,
				section = this;

			// Watch for changes to the panel state.
			inject = function( panelId ) {
				var parentContainer;
				api.panel( panelId, function( panel ) {

					// The panel has been registered, wait for it to become ready/initialized.
					panel.deferred.embedded.done( function() {
						parentContainer = panel.contentContainer;
						if ( ! section.headContainer.parent().is( parentContainer ) ) {
							parentContainer.find( '.customize-themes-full-container-container' ).before( section.headContainer );
						}
						if ( ! section.contentContainer.parent().is( section.headContainer ) ) {
							section.containerParent.append( section.contentContainer );
						}
						section.deferred.embedded.resolve();
					});
				} );
			};
			section.panel.bind( inject );
			inject( section.panel.get() ); // Since a section may never get a panel, assume that it won't ever get one.
		},

		/**
		 * Set up.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		ready: function() {
			var section = this;
			section.overlay = section.container.find( '.theme-overlay' );
			section.template = wp.template( 'customize-themes-details-view' );

			// Bind global keyboard events.
			section.container.on( 'keydown', function( event ) {
				if ( ! section.overlay.find( '.theme-wrap' ).is( ':visible' ) ) {
					return;
				}

				// Pressing the right arrow key fires a theme:next event.
				if ( 39 === event.keyCode ) {
					section.nextTheme();
				}

				// Pressing the left arrow key fires a theme:previous event.
				if ( 37 === event.keyCode ) {
					section.previousTheme();
				}

				// Pressing the escape key fires a theme:collapse event.
				if ( 27 === event.keyCode ) {
					if ( section.$body.hasClass( 'modal-open' ) ) {

						// Escape from the details modal.
						section.closeDetails();
					} else {

						// Escape from the infinite scroll list.
						section.headerContainer.find( '.customize-themes-section-title' ).focus();
					}
					event.stopPropagation(); // Prevent section from being collapsed.
				}
			});

			section.renderScreenshots = _.throttle( section.renderScreenshots, 100 );

			_.bindAll( section, 'renderScreenshots', 'loadMore', 'checkTerm', 'filtersChecked' );
		},

		/**
		 * Override Section.isContextuallyActive method.
		 *
		 * Ignore the active states' of the contained theme controls, and just
		 * use the section's own active state instead. This prevents empty search
		 * results for theme sections from causing the section to become inactive.
		 *
		 * @since 4.2.0
		 *
		 * @return {boolean}
		 */
		isContextuallyActive: function () {
			return this.active();
		},

		/**
		 * Attach events.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		attachEvents: function () {
			var section = this, debounced;

			// Expand/Collapse accordion sections on click.
			section.container.find( '.customize-section-back' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.
				section.collapse();
			});

			section.headerContainer = $( '#accordion-section-' + section.id );

			// Expand section/panel. Only collapse when opening another section.
			section.headerContainer.on( 'click', '.customize-themes-section-title', function() {

				// Toggle accordion filters under section headers.
				if ( section.headerContainer.find( '.filter-details' ).length ) {
					section.headerContainer.find( '.customize-themes-section-title' )
						.toggleClass( 'details-open' )
						.attr( 'aria-expanded', function( i, attr ) {
							return 'true' === attr ? 'false' : 'true';
						});
					section.headerContainer.find( '.filter-details' ).slideToggle( 180 );
				}

				// Open the section.
				if ( ! section.expanded() ) {
					section.expand();
				}
			});

			// Preview installed themes.
			section.container.on( 'click', '.theme-actions .preview-theme', function() {
				api.panel( 'themes' ).loadThemePreview( $( this ).data( 'slug' ) );
			});

			// Theme navigation in details view.
			section.container.on( 'click', '.left', function() {
				section.previousTheme();
			});

			section.container.on( 'click', '.right', function() {
				section.nextTheme();
			});

			section.container.on( 'click', '.theme-backdrop, .close', function() {
				section.closeDetails();
			});

			if ( 'local' === section.params.filter_type ) {

				// Filter-search all theme objects loaded in the section.
				section.container.on( 'input', '.wp-filter-search-themes', function( event ) {
					section.filterSearch( event.currentTarget.value );
				});

			} else if ( 'remote' === section.params.filter_type ) {

				// Event listeners for remote queries with user-entered terms.
				// Search terms.
				debounced = _.debounce( section.checkTerm, 500 ); // Wait until there is no input for 500 milliseconds to initiate a search.
				section.contentContainer.on( 'input', '.wp-filter-search', function() {
					if ( ! api.panel( 'themes' ).expanded() ) {
						return;
					}
					debounced( section );
					if ( ! section.expanded() ) {
						section.expand();
					}
				});

				// Feature filters.
				section.contentContainer.on( 'click', '.filter-group input', function() {
					section.filtersChecked();
					section.checkTerm( section );
				});
			}

			// Toggle feature filters.
			section.contentContainer.on( 'click', '.feature-filter-toggle', function( e ) {
				var $themeContainer = $( '.customize-themes-full-container' ),
					$filterToggle = $( e.currentTarget );
				section.filtersHeight = $filterToggle.parents( '.themes-filter-bar' ).next( '.filter-drawer' ).height();

				if ( 0 < $themeContainer.scrollTop() ) {
					$themeContainer.animate( { scrollTop: 0 }, 400 );

					if ( $filterToggle.hasClass( 'open' ) ) {
						return;
					}
				}

				$filterToggle
					.toggleClass( 'open' )
					.attr( 'aria-expanded', function( i, attr ) {
						return 'true' === attr ? 'false' : 'true';
					})
					.parents( '.themes-filter-bar' ).next( '.filter-drawer' ).slideToggle( 180, 'linear' );

				if ( $filterToggle.hasClass( 'open' ) ) {
					var marginOffset = 1018 < window.innerWidth ? 50 : 76;

					section.contentContainer.find( '.themes' ).css( 'margin-top', section.filtersHeight + marginOffset );
				} else {
					section.contentContainer.find( '.themes' ).css( 'margin-top', 0 );
				}
			});

			// Setup section cross-linking.
			section.contentContainer.on( 'click', '.no-themes-local .search-dotorg-themes', function() {
				api.section( 'wporg_themes' ).focus();
			});

			function updateSelectedState() {
				var el = section.headerContainer.find( '.customize-themes-section-title' );
				el.toggleClass( 'selected', section.expanded() );
				el.attr( 'aria-expanded', section.expanded() ? 'true' : 'false' );
				if ( ! section.expanded() ) {
					el.removeClass( 'details-open' );
				}
			}
			section.expanded.bind( updateSelectedState );
			updateSelectedState();

			// Move section controls to the themes area.
			api.bind( 'ready', function () {
				section.contentContainer = section.container.find( '.customize-themes-section' );
				section.contentContainer.appendTo( $( '.customize-themes-full-container' ) );
				section.container.add( section.headerContainer );
			});
		},

		/**
		 * Update UI to reflect expanded state
		 *
		 * @since 4.2.0
		 *
		 * @param {boolean}  expanded
		 * @param {Object}   args
		 * @param {boolean}  args.unchanged
		 * @param {Function} args.completeCallback
		 * @return {void}
		 */
		onChangeExpanded: function ( expanded, args ) {

			// Note: there is a second argument 'args' passed.
			var section = this,
				container = section.contentContainer.closest( '.customize-themes-full-container' );

			// Immediately call the complete callback if there were no changes.
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			function expand() {

				// Try to load controls if none are loaded yet.
				if ( 0 === section.loaded ) {
					section.loadThemes();
				}

				// Collapse any sibling sections/panels.
				api.section.each( function ( otherSection ) {
					var searchTerm;

					if ( otherSection !== section ) {

						// Try to sync the current search term to the new section.
						if ( 'themes' === otherSection.params.type ) {
							searchTerm = otherSection.contentContainer.find( '.wp-filter-search' ).val();
							section.contentContainer.find( '.wp-filter-search' ).val( searchTerm );

							// Directly initialize an empty remote search to avoid a race condition.
							if ( '' === searchTerm && '' !== section.term && 'local' !== section.params.filter_type ) {
								section.term = '';
								section.initializeNewQuery( section.term, section.tags );
							} else {
								if ( 'remote' === section.params.filter_type ) {
									section.checkTerm( section );
								} else if ( 'local' === section.params.filter_type ) {
									section.filterSearch( searchTerm );
								}
							}
							otherSection.collapse( { duration: args.duration } );
						}
					}
				});

				section.contentContainer.addClass( 'current-section' );
				container.scrollTop();

				container.on( 'scroll', _.throttle( section.renderScreenshots, 300 ) );
				container.on( 'scroll', _.throttle( section.loadMore, 300 ) );

				if ( args.completeCallback ) {
					args.completeCallback();
				}
				section.updateCount(); // Show this section's count.
			}

			if ( expanded ) {
				if ( section.panel() && api.panel.has( section.panel() ) ) {
					api.panel( section.panel() ).expand({
						duration: args.duration,
						completeCallback: expand
					});
				} else {
					expand();
				}
			} else {
				section.contentContainer.removeClass( 'current-section' );

				// Always hide, even if they don't exist or are already hidden.
				section.headerContainer.find( '.filter-details' ).slideUp( 180 );

				container.off( 'scroll' );

				if ( args.completeCallback ) {
					args.completeCallback();
				}
			}
		},

		/**
		 * Return the section's content element without detaching from the parent.
		 *
		 * @since 4.9.0
		 *
		 * @return {jQuery}
		 */
		getContent: function() {
			return this.container.find( '.control-section-content' );
		},

		/**
		 * Load theme data via Ajax and add themes to the section as controls.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		loadThemes: function() {
			var section = this, params, page, request;

			if ( section.loading ) {
				return; // We're already loading a batch of themes.
			}

			// Parameters for every API query. Additional params are set in PHP.
			page = Math.ceil( section.loaded / 100 ) + 1;
			params = {
				'nonce': api.settings.nonce.switch_themes,
				'wp_customize': 'on',
				'theme_action': section.params.action,
				'customized_theme': api.settings.theme.stylesheet,
				'page': page
			};

			// Add fields for remote filtering.
			if ( 'remote' === section.params.filter_type ) {
				params.search = section.term;
				params.tags = section.tags;
			}

			// Load themes.
			section.headContainer.closest( '.wp-full-overlay' ).addClass( 'loading' );
			section.loading = true;
			section.container.find( '.no-themes' ).hide();
			request = wp.ajax.post( 'customize_load_themes', params );
			request.done(function( data ) {
				var themes = data.themes;

				// Stop and try again if the term changed while loading.
				if ( '' !== section.nextTerm || '' !== section.nextTags ) {
					if ( section.nextTerm ) {
						section.term = section.nextTerm;
					}
					if ( section.nextTags ) {
						section.tags = section.nextTags;
					}
					section.nextTerm = '';
					section.nextTags = '';
					section.loading = false;
					section.loadThemes();
					return;
				}

				if ( 0 !== themes.length ) {

					section.loadControls( themes, page );

					if ( 1 === page ) {

						// Pre-load the first 3 theme screenshots.
						_.each( section.controls().slice( 0, 3 ), function( control ) {
							var img, src = control.params.theme.screenshot[0];
							if ( src ) {
								img = new Image();
								img.src = src;
							}
						});
						if ( 'local' !== section.params.filter_type ) {
							wp.a11y.speak( api.settings.l10n.themeSearchResults.replace( '%d', data.info.results ) );
						}
					}

					_.delay( section.renderScreenshots, 100 ); // Wait for the controls to become visible.

					if ( 'local' === section.params.filter_type || 100 > themes.length ) {
						// If we have less than the requested 100 themes, it's the end of the list.
						section.fullyLoaded = true;
					}
				} else {
					if ( 0 === section.loaded ) {
						section.container.find( '.no-themes' ).show();
						wp.a11y.speak( section.container.find( '.no-themes' ).text() );
					} else {
						section.fullyLoaded = true;
					}
				}
				if ( 'local' === section.params.filter_type ) {
					section.updateCount(); // Count of visible theme controls.
				} else {
					section.updateCount( data.info.results ); // Total number of results including pages not yet loaded.
				}
				section.container.find( '.unexpected-error' ).hide(); // Hide error notice in case it was previously shown.

				// This cannot run on request.always, as section.loading may turn false before the new controls load in the success case.
				section.headContainer.closest( '.wp-full-overlay' ).removeClass( 'loading' );
				section.loading = false;
			});
			request.fail(function( data ) {
				if ( 'undefined' === typeof data ) {
					section.container.find( '.unexpected-error' ).show();
					wp.a11y.speak( section.container.find( '.unexpected-error' ).text() );
				} else if ( 'undefined' !== typeof console && console.error ) {
					console.error( data );
				}

				// This cannot run on request.always, as section.loading may turn false before the new controls load in the success case.
				section.headContainer.closest( '.wp-full-overlay' ).removeClass( 'loading' );
				section.loading = false;
			});
		},

		/**
		 * Loads controls into the section from data received from loadThemes().
		 *
		 * @since 4.9.0
		 * @param {Array}  themes - Array of theme data to create controls with.
		 * @param {number} page   - Page of results being loaded.
		 * @return {void}
		 */
		loadControls: function( themes, page ) {
			var newThemeControls = [],
				section = this;

			// Add controls for each theme.
			_.each( themes, function( theme ) {
				var themeControl = new api.controlConstructor.theme( section.params.action + '_theme_' + theme.id, {
					type: 'theme',
					section: section.params.id,
					theme: theme,
					priority: section.loaded + 1
				} );

				api.control.add( themeControl );
				newThemeControls.push( themeControl );
				section.loaded = section.loaded + 1;
			});

			if ( 1 !== page ) {
				Array.prototype.push.apply( section.screenshotQueue, newThemeControls ); // Add new themes to the screenshot queue.
			}
		},

		/**
		 * Determines whether more themes should be loaded, and loads them.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		loadMore: function() {
			var section = this, container, bottom, threshold;
			if ( ! section.fullyLoaded && ! section.loading ) {
				container = section.container.closest( '.customize-themes-full-container' );

				bottom = container.scrollTop() + container.height();
				// Use a fixed distance to the bottom of loaded results to avoid unnecessarily
				// loading results sooner when using a percentage of scroll distance.
				threshold = container.prop( 'scrollHeight' ) - 3000;

				if ( bottom > threshold ) {
					section.loadThemes();
				}
			}
		},

		/**
		 * Event handler for search input that filters visible controls.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} term - The raw search input value.
		 * @return {void}
		 */
		filterSearch: function( term ) {
			var count = 0,
				visible = false,
				section = this,
				noFilter = ( api.section.has( 'wporg_themes' ) && 'remote' !== section.params.filter_type ) ? '.no-themes-local' : '.no-themes',
				controls = section.controls(),
				terms;

			if ( section.loading ) {
				return;
			}

			// Standardize search term format and split into an array of individual words.
			terms = term.toLowerCase().trim().replace( /-/g, ' ' ).split( ' ' );

			_.each( controls, function( control ) {
				visible = control.filter( terms ); // Shows/hides and sorts control based on the applicability of the search term.
				if ( visible ) {
					count = count + 1;
				}
			});

			if ( 0 === count ) {
				section.container.find( noFilter ).show();
				wp.a11y.speak( section.container.find( noFilter ).text() );
			} else {
				section.container.find( noFilter ).hide();
			}

			section.renderScreenshots();
			api.reflowPaneContents();

			// Update theme count.
			section.updateCountDebounced( count );
		},

		/**
		 * Event handler for search input that determines if the terms have changed and loads new controls as needed.
		 *
		 * @since 4.9.0
		 *
		 * @param {wp.customize.ThemesSection} section - The current theme section, passed through the debouncer.
		 * @return {void}
		 */
		checkTerm: function( section ) {
			var newTerm;
			if ( 'remote' === section.params.filter_type ) {
				newTerm = section.contentContainer.find( '.wp-filter-search' ).val();
				if ( section.term !== newTerm.trim() ) {
					section.initializeNewQuery( newTerm, section.tags );
				}
			}
		},

		/**
		 * Check for filters checked in the feature filter list and initialize a new query.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		filtersChecked: function() {
			var section = this,
			    items = section.container.find( '.filter-group' ).find( ':checkbox' ),
			    tags = [];

			_.each( items.filter( ':checked' ), function( item ) {
				tags.push( $( item ).prop( 'value' ) );
			});

			// When no filters are checked, restore initial state. Update filter count.
			if ( 0 === tags.length ) {
				tags = '';
				section.contentContainer.find( '.feature-filter-toggle .filter-count-0' ).show();
				section.contentContainer.find( '.feature-filter-toggle .filter-count-filters' ).hide();
			} else {
				section.contentContainer.find( '.feature-filter-toggle .theme-filter-count' ).text( tags.length );
				section.contentContainer.find( '.feature-filter-toggle .filter-count-0' ).hide();
				section.contentContainer.find( '.feature-filter-toggle .filter-count-filters' ).show();
			}

			// Check whether tags have changed, and either load or queue them.
			if ( ! _.isEqual( section.tags, tags ) ) {
				if ( section.loading ) {
					section.nextTags = tags;
				} else {
					if ( 'remote' === section.params.filter_type ) {
						section.initializeNewQuery( section.term, tags );
					} else if ( 'local' === section.params.filter_type ) {
						section.filterSearch( tags.join( ' ' ) );
					}
				}
			}
		},

		/**
		 * Reset the current query and load new results.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} newTerm - New term.
		 * @param {Array} newTags - New tags.
		 * @return {void}
		 */
		initializeNewQuery: function( newTerm, newTags ) {
			var section = this;

			// Clear the controls in the section.
			_.each( section.controls(), function( control ) {
				control.container.remove();
				api.control.remove( control.id );
			});
			section.loaded = 0;
			section.fullyLoaded = false;
			section.screenshotQueue = null;

			// Run a new query, with loadThemes handling paging, etc.
			if ( ! section.loading ) {
				section.term = newTerm;
				section.tags = newTags;
				section.loadThemes();
			} else {
				section.nextTerm = newTerm; // This will reload from loadThemes() with the newest term once the current batch is loaded.
				section.nextTags = newTags; // This will reload from loadThemes() with the newest tags once the current batch is loaded.
			}
			if ( ! section.expanded() ) {
				section.expand(); // Expand the section if it isn't expanded.
			}
		},

		/**
		 * Render control's screenshot if the control comes into view.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		renderScreenshots: function() {
			var section = this;

			// Fill queue initially, or check for more if empty.
			if ( null === section.screenshotQueue || 0 === section.screenshotQueue.length ) {

				// Add controls that haven't had their screenshots rendered.
				section.screenshotQueue = _.filter( section.controls(), function( control ) {
					return ! control.screenshotRendered;
				});
			}

			// Are all screenshots rendered (for now)?
			if ( ! section.screenshotQueue.length ) {
				return;
			}

			section.screenshotQueue = _.filter( section.screenshotQueue, function( control ) {
				var $imageWrapper = control.container.find( '.theme-screenshot' ),
					$image = $imageWrapper.find( 'img' );

				if ( ! $image.length ) {
					return false;
				}

				if ( $image.is( ':hidden' ) ) {
					return true;
				}

				// Based on unveil.js.
				var wt = section.$window.scrollTop(),
					wb = wt + section.$window.height(),
					et = $image.offset().top,
					ih = $imageWrapper.height(),
					eb = et + ih,
					threshold = ih * 3,
					inView = eb >= wt - threshold && et <= wb + threshold;

				if ( inView ) {
					control.container.trigger( 'render-screenshot' );
				}

				// If the image is in view return false so it's cleared from the queue.
				return ! inView;
			} );
		},

		/**
		 * Get visible count.
		 *
		 * @since 4.9.0
		 *
		 * @return {number} Visible count.
		 */
		getVisibleCount: function() {
			return this.contentContainer.find( 'li.customize-control:visible' ).length;
		},

		/**
		 * Update the number of themes in the section.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		updateCount: function( count ) {
			var section = this, countEl, displayed;

			if ( ! count && 0 !== count ) {
				count = section.getVisibleCount();
			}

			displayed = section.contentContainer.find( '.themes-displayed' );
			countEl = section.contentContainer.find( '.theme-count' );

			if ( 0 === count ) {
				countEl.text( '0' );
			} else {

				// Animate the count change for emphasis.
				displayed.fadeOut( 180, function() {
					countEl.text( count );
					displayed.fadeIn( 180 );
				} );
				wp.a11y.speak( api.settings.l10n.announceThemeCount.replace( '%d', count ) );
			}
		},

		/**
		 * Advance the modal to the next theme.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		nextTheme: function () {
			var section = this;
			if ( section.getNextTheme() ) {
				section.showDetails( section.getNextTheme(), function() {
					section.overlay.find( '.right' ).focus();
				} );
			}
		},

		/**
		 * Get the next theme model.
		 *
		 * @since 4.2.0
		 *
		 * @return {wp.customize.ThemeControl|boolean} Next theme.
		 */
		getNextTheme: function () {
			var section = this, control, nextControl, sectionControls, i;
			control = api.control( section.params.action + '_theme_' + section.currentTheme );
			sectionControls = section.controls();
			i = _.indexOf( sectionControls, control );
			if ( -1 === i ) {
				return false;
			}

			nextControl = sectionControls[ i + 1 ];
			if ( ! nextControl ) {
				return false;
			}
			return nextControl.params.theme;
		},

		/**
		 * Advance the modal to the previous theme.
		 *
		 * @since 4.2.0
		 * @return {void}
		 */
		previousTheme: function () {
			var section = this;
			if ( section.getPreviousTheme() ) {
				section.showDetails( section.getPreviousTheme(), function() {
					section.overlay.find( '.left' ).focus();
				} );
			}
		},

		/**
		 * Get the previous theme model.
		 *
		 * @since 4.2.0
		 * @return {wp.customize.ThemeControl|boolean} Previous theme.
		 */
		getPreviousTheme: function () {
			var section = this, control, nextControl, sectionControls, i;
			control = api.control( section.params.action + '_theme_' + section.currentTheme );
			sectionControls = section.controls();
			i = _.indexOf( sectionControls, control );
			if ( -1 === i ) {
				return false;
			}

			nextControl = sectionControls[ i - 1 ];
			if ( ! nextControl ) {
				return false;
			}
			return nextControl.params.theme;
		},

		/**
		 * Disable buttons when we're viewing the first or last theme.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		updateLimits: function () {
			if ( ! this.getNextTheme() ) {
				this.overlay.find( '.right' ).addClass( 'disabled' );
			}
			if ( ! this.getPreviousTheme() ) {
				this.overlay.find( '.left' ).addClass( 'disabled' );
			}
		},

		/**
		 * Load theme preview.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @deprecated
		 * @param {string} themeId Theme ID.
		 * @return {jQuery.promise} Promise.
		 */
		loadThemePreview: function( themeId ) {
			return api.ThemesPanel.prototype.loadThemePreview.call( this, themeId );
		},

		/**
		 * Render & show the theme details for a given theme model.
		 *
		 * @since 4.2.0
		 *
		 * @param {Object} theme - Theme.
		 * @param {Function} [callback] - Callback once the details have been shown.
		 * @return {void}
		 */
		showDetails: function ( theme, callback ) {
			var section = this, panel = api.panel( 'themes' );
			section.currentTheme = theme.id;
			section.overlay.html( section.template( theme ) )
				.fadeIn( 'fast' )
				.focus();

			function disableSwitchButtons() {
				return ! panel.canSwitchTheme( theme.id );
			}

			// Temporary special function since supplying SFTP credentials does not work yet. See #42184.
			function disableInstallButtons() {
				return disableSwitchButtons() || false === api.settings.theme._canInstall || true === api.settings.theme._filesystemCredentialsNeeded;
			}

			section.overlay.find( 'button.preview, button.preview-theme' ).toggleClass( 'disabled', disableSwitchButtons() );
			section.overlay.find( 'button.theme-install' ).toggleClass( 'disabled', disableInstallButtons() );

			section.$body.addClass( 'modal-open' );
			section.containFocus( section.overlay );
			section.updateLimits();
			wp.a11y.speak( api.settings.l10n.announceThemeDetails.replace( '%s', theme.name ) );
			if ( callback ) {
				callback();
			}
		},

		/**
		 * Close the theme details modal.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		closeDetails: function () {
			var section = this;
			section.$body.removeClass( 'modal-open' );
			section.overlay.fadeOut( 'fast' );
			api.control( section.params.action + '_theme_' + section.currentTheme ).container.find( '.theme' ).focus();
		},

		/**
		 * Keep tab focus within the theme details modal.
		 *
		 * @since 4.2.0
		 *
		 * @param {jQuery} el - Element to contain focus.
		 * @return {void}
		 */
		containFocus: function( el ) {
			var tabbables;

			el.on( 'keydown', function( event ) {

				// Return if it's not the tab key
				// When navigating with prev/next focus is already handled.
				if ( 9 !== event.keyCode ) {
					return;
				}

				// Uses jQuery UI to get the tabbable elements.
				tabbables = $( ':tabbable', el );

				// Keep focus within the overlay.
				if ( tabbables.last()[0] === event.target && ! event.shiftKey ) {
					tabbables.first().focus();
					return false;
				} else if ( tabbables.first()[0] === event.target && event.shiftKey ) {
					tabbables.last().focus();
					return false;
				}
			});
		}
	});

	api.OuterSection = api.Section.extend(/** @lends wp.customize.OuterSection.prototype */{

		/**
		 * Class wp.customize.OuterSection.
		 *
		 * Creates section outside of the sidebar, there is no ui to trigger collapse/expand so
		 * it would require custom handling.
		 *
		 * @constructs wp.customize.OuterSection
		 * @augments   wp.customize.Section
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		initialize: function() {
			var section = this;
			section.containerParent = '#customize-outer-theme-controls';
			section.containerPaneParent = '.customize-outer-pane-parent';
			api.Section.prototype.initialize.apply( section, arguments );
		},

		/**
		 * Overrides api.Section.prototype.onChangeExpanded to prevent collapse/expand effect
		 * on other sections and panels.
		 *
		 * @since 4.9.0
		 *
		 * @param {boolean}  expanded - The expanded state to transition to.
		 * @param {Object}   [args] - Args.
		 * @param {boolean}  [args.unchanged] - Whether the state is already known to not be changed, and so short-circuit with calling completeCallback early.
		 * @param {Function} [args.completeCallback] - Function to call when the slideUp/slideDown has completed.
		 * @param {Object}   [args.duration] - The duration for the animation.
		 */
		onChangeExpanded: function( expanded, args ) {
			var section = this,
				container = section.headContainer.closest( '.wp-full-overlay-sidebar-content' ),
				content = section.contentContainer,
				backBtn = content.find( '.customize-section-back' ),
				sectionTitle = section.headContainer.find( '.accordion-section-title button' ).first(),
				body = $( document.body ),
				expand, panel;

			body.toggleClass( 'outer-section-open', expanded );
			section.container.toggleClass( 'open', expanded );
			section.container.removeClass( 'busy' );
			api.section.each( function( _section ) {
				if ( 'outer' === _section.params.type && _section.id !== section.id ) {
					_section.container.removeClass( 'open' );
				}
			} );

			if ( expanded && ! content.hasClass( 'open' ) ) {

				if ( args.unchanged ) {
					expand = args.completeCallback;
				} else {
					expand = function() {
						section._animateChangeExpanded( function() {
							backBtn.trigger( 'focus' );
							content.css( 'top', '' );
							container.scrollTop( 0 );

							if ( args.completeCallback ) {
								args.completeCallback();
							}
						} );

						content.addClass( 'open' );
					}.bind( this );
				}

				if ( section.panel() ) {
					api.panel( section.panel() ).expand({
						duration: args.duration,
						completeCallback: expand
					});
				} else {
					expand();
				}

			} else if ( ! expanded && content.hasClass( 'open' ) ) {
				if ( section.panel() ) {
					panel = api.panel( section.panel() );
					if ( panel.contentContainer.hasClass( 'skip-transition' ) ) {
						panel.collapse();
					}
				}
				section._animateChangeExpanded( function() {

					sectionTitle.trigger( 'focus' );
					content.css( 'top', '' );

					if ( args.completeCallback ) {
						args.completeCallback();
					}
				} );

				content.removeClass( 'open' );

			} else {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			}
		}
	});

	api.Panel = Container.extend(/** @lends wp.customize.Panel.prototype */{
		containerType: 'panel',

		/**
		 * @constructs wp.customize.Panel
		 * @augments   wp.customize~Container
		 *
		 * @since 4.1.0
		 *
		 * @param {string}  id - The ID for the panel.
		 * @param {Object}  options - Object containing one property: params.
		 * @param {string}  options.title - Title shown when panel is collapsed and expanded.
		 * @param {string}  [options.description] - Description shown at the top of the panel.
		 * @param {number}  [options.priority=100] - The sort priority for the panel.
		 * @param {string}  [options.type=default] - The type of the panel. See wp.customize.panelConstructor.
		 * @param {string}  [options.content] - The markup to be used for the panel container. If empty, a JS template is used.
		 * @param {boolean} [options.active=true] - Whether the panel is active or not.
		 * @param {Object}  [options.params] - Deprecated wrapper for the above properties.
		 */
		initialize: function ( id, options ) {
			var panel = this, params;
			params = options.params || options;

			// Look up the type if one was not supplied.
			if ( ! params.type ) {
				_.find( api.panelConstructor, function( Constructor, type ) {
					if ( Constructor === panel.constructor ) {
						params.type = type;
						return true;
					}
					return false;
				} );
			}

			Container.prototype.initialize.call( panel, id, params );

			panel.embed();
			panel.deferred.embedded.done( function () {
				panel.ready();
			});
		},

		/**
		 * Embed the container in the DOM when any parent panel is ready.
		 *
		 * @since 4.1.0
		 */
		embed: function () {
			var panel = this,
				container = $( '#customize-theme-controls' ),
				parentContainer = $( '.customize-pane-parent' ); // @todo This should be defined elsewhere, and to be configurable.

			if ( ! panel.headContainer.parent().is( parentContainer ) ) {
				parentContainer.append( panel.headContainer );
			}
			if ( ! panel.contentContainer.parent().is( panel.headContainer ) ) {
				container.append( panel.contentContainer );
			}
			panel.renderContent();

			panel.deferred.embedded.resolve();
		},

		/**
		 * @since 4.1.0
		 */
		attachEvents: function () {
			var meta, panel = this;

			// Expand/Collapse accordion sections on click.
			panel.headContainer.find( '.accordion-section-title button' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.

				if ( ! panel.expanded() ) {
					panel.expand();
				}
			});

			// Close panel.
			panel.container.find( '.customize-panel-back' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.

				if ( panel.expanded() ) {
					panel.collapse();
				}
			});

			meta = panel.container.find( '.panel-meta:first' );

			meta.find( '> .accordion-section-title .customize-help-toggle' ).on( 'click', function() {
				if ( meta.hasClass( 'cannot-expand' ) ) {
					return;
				}

				var content = meta.find( '.customize-panel-description:first' );
				if ( meta.hasClass( 'open' ) ) {
					meta.toggleClass( 'open' );
					content.slideUp( panel.defaultExpandedArguments.duration, function() {
						content.trigger( 'toggled' );
					} );
					$( this ).attr( 'aria-expanded', false );
				} else {
					content.slideDown( panel.defaultExpandedArguments.duration, function() {
						content.trigger( 'toggled' );
					} );
					meta.toggleClass( 'open' );
					$( this ).attr( 'aria-expanded', true );
				}
			});

		},

		/**
		 * Get the sections that are associated with this panel, sorted by their priority Value.
		 *
		 * @since 4.1.0
		 *
		 * @return {Array}
		 */
		sections: function () {
			return this._children( 'panel', 'section' );
		},

		/**
		 * Return whether this panel has any active sections.
		 *
		 * @since 4.1.0
		 *
		 * @return {boolean} Whether contextually active.
		 */
		isContextuallyActive: function () {
			var panel = this,
				sections = panel.sections(),
				activeCount = 0;
			_( sections ).each( function ( section ) {
				if ( section.active() && section.isContextuallyActive() ) {
					activeCount += 1;
				}
			} );
			return ( activeCount !== 0 );
		},

		/**
		 * Update UI to reflect expanded state.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean}  expanded
		 * @param {Object}   args
		 * @param {boolean}  args.unchanged
		 * @param {Function} args.completeCallback
		 * @return {void}
		 */
		onChangeExpanded: function ( expanded, args ) {

			// Immediately call the complete callback if there were no changes.
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			// Note: there is a second argument 'args' passed.
			var panel = this,
				accordionSection = panel.contentContainer,
				overlay = accordionSection.closest( '.wp-full-overlay' ),
				container = accordionSection.closest( '.wp-full-overlay-sidebar-content' ),
				topPanel = panel.headContainer.find( '.accordion-section-title button' ),
				backBtn = accordionSection.find( '.customize-panel-back' ),
				childSections = panel.sections(),
				skipTransition;

			if ( expanded && ! accordionSection.hasClass( 'current-panel' ) ) {
				// Collapse any sibling sections/panels.
				api.section.each( function ( section ) {
					if ( panel.id !== section.panel() ) {
						section.collapse( { duration: 0 } );
					}
				});
				api.panel.each( function ( otherPanel ) {
					if ( panel !== otherPanel ) {
						otherPanel.collapse( { duration: 0 } );
					}
				});

				if ( panel.params.autoExpandSoleSection && 1 === childSections.length && childSections[0].active.get() ) {
					accordionSection.addClass( 'current-panel skip-transition' );
					overlay.addClass( 'in-sub-panel' );

					childSections[0].expand( {
						completeCallback: args.completeCallback
					} );
				} else {
					panel._animateChangeExpanded( function() {
						backBtn.trigger( 'focus' );
						accordionSection.css( 'top', '' );
						container.scrollTop( 0 );

						if ( args.completeCallback ) {
							args.completeCallback();
						}
					} );

					accordionSection.addClass( 'current-panel' );
					overlay.addClass( 'in-sub-panel' );
				}

				api.state( 'expandedPanel' ).set( panel );

			} else if ( ! expanded && accordionSection.hasClass( 'current-panel' ) ) {
				skipTransition = accordionSection.hasClass( 'skip-transition' );
				if ( ! skipTransition ) {
					panel._animateChangeExpanded( function() {

						topPanel.focus();
						accordionSection.css( 'top', '' );

						if ( args.completeCallback ) {
							args.completeCallback();
						}
					} );
				} else {
					accordionSection.removeClass( 'skip-transition' );
				}

				overlay.removeClass( 'in-sub-panel' );
				accordionSection.removeClass( 'current-panel' );
				if ( panel === api.state( 'expandedPanel' ).get() ) {
					api.state( 'expandedPanel' ).set( false );
				}
			}
		},

		/**
		 * Render the panel from its JS template, if it exists.
		 *
		 * The panel's container must already exist in the DOM.
		 *
		 * @since 4.3.0
		 */
		renderContent: function () {
			var template,
				panel = this;

			// Add the content to the container.
			if ( 0 !== $( '#tmpl-' + panel.templateSelector + '-content' ).length ) {
				template = wp.template( panel.templateSelector + '-content' );
			} else {
				template = wp.template( 'customize-panel-default-content' );
			}
			if ( template && panel.headContainer ) {
				panel.contentContainer.html( template( _.extend(
					{ id: panel.id },
					panel.params
				) ) );
			}
		}
	});

	api.ThemesPanel = api.Panel.extend(/** @lends wp.customize.ThemsPanel.prototype */{

		/**
		 *  Class wp.customize.ThemesPanel.
		 *
		 * Custom section for themes that displays without the customize preview.
		 *
		 * @constructs wp.customize.ThemesPanel
		 * @augments   wp.customize.Panel
		 *
		 * @since 4.9.0
		 *
		 * @param {string} id - The ID for the panel.
		 * @param {Object} options - Options.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var panel = this;
			panel.installingThemes = [];
			api.Panel.prototype.initialize.call( panel, id, options );
		},

		/**
		 * Determine whether a given theme can be switched to, or in general.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} [slug] - Theme slug.
		 * @return {boolean} Whether the theme can be switched to.
		 */
		canSwitchTheme: function canSwitchTheme( slug ) {
			if ( slug && slug === api.settings.theme.stylesheet ) {
				return true;
			}
			return 'publish' === api.state( 'selectedChangesetStatus' ).get() && ( '' === api.state( 'changesetStatus' ).get() || 'auto-draft' === api.state( 'changesetStatus' ).get() );
		},

		/**
		 * Attach events.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		attachEvents: function() {
			var panel = this;

			// Attach regular panel events.
			api.Panel.prototype.attachEvents.apply( panel );

			// Temporary since supplying SFTP credentials does not work yet. See #42184.
			if ( api.settings.theme._canInstall && api.settings.theme._filesystemCredentialsNeeded ) {
				panel.notifications.add( new api.Notification( 'theme_install_unavailable', {
					message: api.l10n.themeInstallUnavailable,
					type: 'info',
					dismissible: true
				} ) );
			}

			function toggleDisabledNotifications() {
				if ( panel.canSwitchTheme() ) {
					panel.notifications.remove( 'theme_switch_unavailable' );
				} else {
					panel.notifications.add( new api.Notification( 'theme_switch_unavailable', {
						message: api.l10n.themePreviewUnavailable,
						type: 'warning'
					} ) );
				}
			}
			toggleDisabledNotifications();
			api.state( 'selectedChangesetStatus' ).bind( toggleDisabledNotifications );
			api.state( 'changesetStatus' ).bind( toggleDisabledNotifications );

			// Collapse panel to customize the current theme.
			panel.contentContainer.on( 'click', '.customize-theme', function() {
				panel.collapse();
			});

			// Toggle between filtering and browsing themes on mobile.
			panel.contentContainer.on( 'click', '.customize-themes-section-title, .customize-themes-mobile-back', function() {
				$( '.wp-full-overlay' ).toggleClass( 'showing-themes' );
			});

			// Install (and maybe preview) a theme.
			panel.contentContainer.on( 'click', '.theme-install', function( event ) {
				panel.installTheme( event );
			});

			// Update a theme. Theme cards have the class, the details modal has the id.
			panel.contentContainer.on( 'click', '.update-theme, #update-theme', function( event ) {

				// #update-theme is a link.
				event.preventDefault();
				event.stopPropagation();

				panel.updateTheme( event );
			});

			// Delete a theme.
			panel.contentContainer.on( 'click', '.delete-theme', function( event ) {
				panel.deleteTheme( event );
			});

			_.bindAll( panel, 'installTheme', 'updateTheme' );
		},

		/**
		 * Update UI to reflect expanded state
		 *
		 * @since 4.9.0
		 *
		 * @param {boolean}  expanded - Expanded state.
		 * @param {Object}   args - Args.
		 * @param {boolean}  args.unchanged - Whether or not the state changed.
		 * @param {Function} args.completeCallback - Callback to execute when the animation completes.
		 * @return {void}
		 */
		onChangeExpanded: function( expanded, args ) {
			var panel = this, overlay, sections, hasExpandedSection = false;

			// Expand/collapse the panel normally.
			api.Panel.prototype.onChangeExpanded.apply( this, [ expanded, args ] );

			// Immediately call the complete callback if there were no changes.
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			overlay = panel.headContainer.closest( '.wp-full-overlay' );

			if ( expanded ) {
				overlay
					.addClass( 'in-themes-panel' )
					.delay( 200 ).find( '.customize-themes-full-container' ).addClass( 'animate' );

				_.delay( function() {
					overlay.addClass( 'themes-panel-expanded' );
				}, 200 );

				// Automatically open the first section (except on small screens), if one isn't already expanded.
				if ( 600 < window.innerWidth ) {
					sections = panel.sections();
					_.each( sections, function( section ) {
						if ( section.expanded() ) {
							hasExpandedSection = true;
						}
					} );
					if ( ! hasExpandedSection && sections.length > 0 ) {
						sections[0].expand();
					}
				}
			} else {
				overlay
					.removeClass( 'in-themes-panel themes-panel-expanded' )
					.find( '.customize-themes-full-container' ).removeClass( 'animate' );
			}
		},

		/**
		 * Install a theme via wp.updates.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {jQuery.promise} Promise.
		 */
		installTheme: function( event ) {
			var panel = this, preview, onInstallSuccess, slug = $( event.target ).data( 'slug' ), deferred = $.Deferred(), request;
			preview = $( event.target ).hasClass( 'preview' );

			// Temporary since supplying SFTP credentials does not work yet. See #42184.
			if ( api.settings.theme._filesystemCredentialsNeeded ) {
				deferred.reject({
					errorCode: 'theme_install_unavailable'
				});
				return deferred.promise();
			}

			// Prevent loading a non-active theme preview when there is a drafted/scheduled changeset.
			if ( ! panel.canSwitchTheme( slug ) ) {
				deferred.reject({
					errorCode: 'theme_switch_unavailable'
				});
				return deferred.promise();
			}

			// Theme is already being installed.
			if ( _.contains( panel.installingThemes, slug ) ) {
				deferred.reject({
					errorCode: 'theme_already_installing'
				});
				return deferred.promise();
			}

			wp.updates.maybeRequestFilesystemCredentials( event );

			onInstallSuccess = function( response ) {
				var theme = false, themeControl;
				if ( preview ) {
					api.notifications.remove( 'theme_installing' );

					panel.loadThemePreview( slug );

				} else {
					api.control.each( function( control ) {
						if ( 'theme' === control.params.type && control.params.theme.id === response.slug ) {
							theme = control.params.theme; // Used below to add theme control.
							control.rerenderAsInstalled( true );
						}
					});

					// Don't add the same theme more than once.
					if ( ! theme || api.control.has( 'installed_theme_' + theme.id ) ) {
						deferred.resolve( response );
						return;
					}

					// Add theme control to installed section.
					theme.type = 'installed';
					themeControl = new api.controlConstructor.theme( 'installed_theme_' + theme.id, {
						type: 'theme',
						section: 'installed_themes',
						theme: theme,
						priority: 0 // Add all newly-installed themes to the top.
					} );

					api.control.add( themeControl );
					api.control( themeControl.id ).container.trigger( 'render-screenshot' );

					// Close the details modal if it's open to the installed theme.
					api.section.each( function( section ) {
						if ( 'themes' === section.params.type ) {
							if ( theme.id === section.currentTheme ) { // Don't close the modal if the user has navigated elsewhere.
								section.closeDetails();
							}
						}
					});
				}
				deferred.resolve( response );
			};

			panel.installingThemes.push( slug ); // Note: we don't remove elements from installingThemes, since they shouldn't be installed again.
			request = wp.updates.installTheme( {
				slug: slug
			} );

			// Also preview the theme as the event is triggered on Install & Preview.
			if ( preview ) {
				api.notifications.add( new api.OverlayNotification( 'theme_installing', {
					message: api.l10n.themeDownloading,
					type: 'info',
					loading: true
				} ) );
			}

			request.done( onInstallSuccess );
			request.fail( function() {
				api.notifications.remove( 'theme_installing' );
			} );

			return deferred.promise();
		},

		/**
		 * Load theme preview.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} themeId Theme ID.
		 * @return {jQuery.promise} Promise.
		 */
		loadThemePreview: function( themeId ) {
			var panel = this, deferred = $.Deferred(), onceProcessingComplete, urlParser, queryParams;

			// Prevent loading a non-active theme preview when there is a drafted/scheduled changeset.
			if ( ! panel.canSwitchTheme( themeId ) ) {
				deferred.reject({
					errorCode: 'theme_switch_unavailable'
				});
				return deferred.promise();
			}

			urlParser = document.createElement( 'a' );
			urlParser.href = location.href;
			queryParams = _.extend(
				api.utils.parseQueryString( urlParser.search.substr( 1 ) ),
				{
					theme: themeId,
					changeset_uuid: api.settings.changeset.uuid,
					'return': api.settings.url['return']
				}
			);

			// Include autosaved param to load autosave revision without prompting user to restore it.
			if ( ! api.state( 'saved' ).get() ) {
				queryParams.customize_autosaved = 'on';
			}

			urlParser.search = $.param( queryParams );

			// Update loading message. Everything else is handled by reloading the page.
			api.notifications.add( new api.OverlayNotification( 'theme_previewing', {
				message: api.l10n.themePreviewWait,
				type: 'info',
				loading: true
			} ) );

			onceProcessingComplete = function() {
				var request;
				if ( api.state( 'processing' ).get() > 0 ) {
					return;
				}

				api.state( 'processing' ).unbind( onceProcessingComplete );

				request = api.requestChangesetUpdate( {}, { autosave: true } );
				request.done( function() {
					deferred.resolve();
					$( window ).off( 'beforeunload.customize-confirm' );
					location.replace( urlParser.href );
				} );
				request.fail( function() {

					// @todo Show notification regarding failure.
					api.notifications.remove( 'theme_previewing' );

					deferred.reject();
				} );
			};

			if ( 0 === api.state( 'processing' ).get() ) {
				onceProcessingComplete();
			} else {
				api.state( 'processing' ).bind( onceProcessingComplete );
			}

			return deferred.promise();
		},

		/**
		 * Update a theme via wp.updates.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		updateTheme: function( event ) {
			wp.updates.maybeRequestFilesystemCredentials( event );

			$( document ).one( 'wp-theme-update-success', function( e, response ) {

				// Rerender the control to reflect the update.
				api.control.each( function( control ) {
					if ( 'theme' === control.params.type && control.params.theme.id === response.slug ) {
						control.params.theme.hasUpdate = false;
						control.params.theme.version = response.newVersion;
						setTimeout( function() {
							control.rerenderAsInstalled( true );
						}, 2000 );
					}
				});
			} );

			wp.updates.updateTheme( {
				slug: $( event.target ).closest( '.notice' ).data( 'slug' )
			} );
		},

		/**
		 * Delete a theme via wp.updates.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		deleteTheme: function( event ) {
			var theme, section;
			theme = $( event.target ).data( 'slug' );
			section = api.section( 'installed_themes' );

			event.preventDefault();

			// Temporary since supplying SFTP credentials does not work yet. See #42184.
			if ( api.settings.theme._filesystemCredentialsNeeded ) {
				return;
			}

			// Confirmation dialog for deleting a theme.
			if ( ! window.confirm( api.settings.l10n.confirmDeleteTheme ) ) {
				return;
			}

			wp.updates.maybeRequestFilesystemCredentials( event );

			$( document ).one( 'wp-theme-delete-success', function() {
				var control = api.control( 'installed_theme_' + theme );

				// Remove theme control.
				control.container.remove();
				api.control.remove( control.id );

				// Update installed count.
				section.loaded = section.loaded - 1;
				section.updateCount();

				// Rerender any other theme controls as uninstalled.
				api.control.each( function( control ) {
					if ( 'theme' === control.params.type && control.params.theme.id === theme ) {
						control.rerenderAsInstalled( false );
					}
				});
			} );

			wp.updates.deleteTheme( {
				slug: theme
			} );

			// Close modal and focus the section.
			section.closeDetails();
			section.focus();
		}
	});

	api.Control = api.Class.extend(/** @lends wp.customize.Control.prototype */{
		defaultActiveArguments: { duration: 'fast', completeCallback: $.noop },

		/**
		 * Default params.
		 *
		 * @since 4.9.0
		 * @var {object}
		 */
		defaults: {
			label: '',
			description: '',
			active: true,
			priority: 10
		},

		/**
		 * A Customizer Control.
		 *
		 * A control provides a UI element that allows a user to modify a Customizer Setting.
		 *
		 * @see PHP class WP_Customize_Control.
		 *
		 * @constructs wp.customize.Control
		 * @augments   wp.customize.Class
		 *
		 * @borrows wp.customize~focus as this#focus
		 * @borrows wp.customize~Container#activate as this#activate
		 * @borrows wp.customize~Container#deactivate as this#deactivate
		 * @borrows wp.customize~Container#_toggleActive as this#_toggleActive
		 *
		 * @param {string} id                       - Unique identifier for the control instance.
		 * @param {Object} options                  - Options hash for the control instance.
		 * @param {Object} options.type             - Type of control (e.g. text, radio, dropdown-pages, etc.)
		 * @param {string} [options.content]        - The HTML content for the control or at least its container. This should normally be left blank and instead supplying a templateId.
		 * @param {string} [options.templateId]     - Template ID for control's content.
		 * @param {string} [options.priority=10]    - Order of priority to show the control within the section.
		 * @param {string} [options.active=true]    - Whether the control is active.
		 * @param {string} options.section          - The ID of the section the control belongs to.
		 * @param {mixed}  [options.setting]        - The ID of the main setting or an instance of this setting.
		 * @param {mixed}  options.settings         - An object with keys (e.g. default) that maps to setting IDs or Setting/Value objects, or an array of setting IDs or Setting/Value objects.
		 * @param {mixed}  options.settings.default - The ID of the setting the control relates to.
		 * @param {string} options.settings.data    - @todo Is this used?
		 * @param {string} options.label            - Label.
		 * @param {string} options.description      - Description.
		 * @param {number} [options.instanceNumber] - Order in which this instance was created in relation to other instances.
		 * @param {Object} [options.params]         - Deprecated wrapper for the above properties.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var control = this, deferredSettingIds = [], settings, gatherSettings;

			control.params = _.extend(
				{},
				control.defaults,
				control.params || {}, // In case subclass already defines.
				options.params || options || {} // The options.params property is deprecated, but it is checked first for back-compat.
			);

			if ( ! api.Control.instanceCounter ) {
				api.Control.instanceCounter = 0;
			}
			api.Control.instanceCounter++;
			if ( ! control.params.instanceNumber ) {
				control.params.instanceNumber = api.Control.instanceCounter;
			}

			// Look up the type if one was not supplied.
			if ( ! control.params.type ) {
				_.find( api.controlConstructor, function( Constructor, type ) {
					if ( Constructor === control.constructor ) {
						control.params.type = type;
						return true;
					}
					return false;
				} );
			}

			if ( ! control.params.content ) {
				control.params.content = $( '<li></li>', {
					id: 'customize-control-' + id.replace( /]/g, '' ).replace( /\[/g, '-' ),
					'class': 'customize-control customize-control-' + control.params.type
				} );
			}

			control.id = id;
			control.selector = '#customize-control-' + id.replace( /\]/g, '' ).replace( /\[/g, '-' ); // Deprecated, likely dead code from time before #28709.
			if ( control.params.content ) {
				control.container = $( control.params.content );
			} else {
				control.container = $( control.selector ); // Likely dead, per above. See #28709.
			}

			if ( control.params.templateId ) {
				control.templateSelector = control.params.templateId;
			} else {
				control.templateSelector = 'customize-control-' + control.params.type + '-content';
			}

			control.deferred = _.extend( control.deferred || {}, {
				embedded: new $.Deferred()
			} );
			control.section = new api.Value();
			control.priority = new api.Value();
			control.active = new api.Value();
			control.activeArgumentsQueue = [];
			control.notifications = new api.Notifications({
				alt: control.altNotice
			});

			control.elements = [];

			control.active.bind( function ( active ) {
				var args = control.activeArgumentsQueue.shift();
				args = $.extend( {}, control.defaultActiveArguments, args );
				control.onChangeActive( active, args );
			} );

			control.section.set( control.params.section );
			control.priority.set( isNaN( control.params.priority ) ? 10 : control.params.priority );
			control.active.set( control.params.active );

			api.utils.bubbleChildValueChanges( control, [ 'section', 'priority', 'active' ] );

			control.settings = {};

			settings = {};
			if ( control.params.setting ) {
				settings['default'] = control.params.setting;
			}
			_.extend( settings, control.params.settings );

			// Note: Settings can be an array or an object, with values being either setting IDs or Setting (or Value) objects.
			_.each( settings, function( value, key ) {
				var setting;
				if ( _.isObject( value ) && _.isFunction( value.extended ) && value.extended( api.Value ) ) {
					control.settings[ key ] = value;
				} else if ( _.isString( value ) ) {
					setting = api( value );
					if ( setting ) {
						control.settings[ key ] = setting;
					} else {
						deferredSettingIds.push( value );
					}
				}
			} );

			gatherSettings = function() {

				// Fill-in all resolved settings.
				_.each( settings, function ( settingId, key ) {
					if ( ! control.settings[ key ] && _.isString( settingId ) ) {
						control.settings[ key ] = api( settingId );
					}
				} );

				// Make sure settings passed as array gets associated with default.
				if ( control.settings[0] && ! control.settings['default'] ) {
					control.settings['default'] = control.settings[0];
				}

				// Identify the main setting.
				control.setting = control.settings['default'] || null;

				control.linkElements(); // Link initial elements present in server-rendered content.
				control.embed();
			};

			if ( 0 === deferredSettingIds.length ) {
				gatherSettings();
			} else {
				api.apply( api, deferredSettingIds.concat( gatherSettings ) );
			}

			// After the control is embedded on the page, invoke the "ready" method.
			control.deferred.embedded.done( function () {
				control.linkElements(); // Link any additional elements after template is rendered by renderContent().
				control.setupNotifications();
				control.ready();
			});
		},

		/**
		 * Link elements between settings and inputs.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @return {void}
		 */
		linkElements: function () {
			var control = this, nodes, radios, element;

			nodes = control.container.find( '[data-customize-setting-link], [data-customize-setting-key-link]' );
			radios = {};

			nodes.each( function () {
				var node = $( this ), name, setting;

				if ( node.data( 'customizeSettingLinked' ) ) {
					return;
				}
				node.data( 'customizeSettingLinked', true ); // Prevent re-linking element.

				if ( node.is( ':radio' ) ) {
					name = node.prop( 'name' );
					if ( radios[name] ) {
						return;
					}

					radios[name] = true;
					node = nodes.filter( '[name="' + name + '"]' );
				}

				// Let link by default refer to setting ID. If it doesn't exist, fallback to looking up by setting key.
				if ( node.data( 'customizeSettingLink' ) ) {
					setting = api( node.data( 'customizeSettingLink' ) );
				} else if ( node.data( 'customizeSettingKeyLink' ) ) {
					setting = control.settings[ node.data( 'customizeSettingKeyLink' ) ];
				}

				if ( setting ) {
					element = new api.Element( node );
					control.elements.push( element );
					element.sync( setting );
					element.set( setting() );
				}
			} );
		},

		/**
		 * Embed the control into the page.
		 */
		embed: function () {
			var control = this,
				inject;

			// Watch for changes to the section state.
			inject = function ( sectionId ) {
				var parentContainer;
				if ( ! sectionId ) { // @todo Allow a control to be embedded without a section, for instance a control embedded in the front end.
					return;
				}
				// Wait for the section to be registered.
				api.section( sectionId, function ( section ) {
					// Wait for the section to be ready/initialized.
					section.deferred.embedded.done( function () {
						parentContainer = ( section.contentContainer.is( 'ul' ) ) ? section.contentContainer : section.contentContainer.find( 'ul:first' );
						if ( ! control.container.parent().is( parentContainer ) ) {
							parentContainer.append( control.container );
						}
						control.renderContent();
						control.deferred.embedded.resolve();
					});
				});
			};
			control.section.bind( inject );
			inject( control.section.get() );
		},

		/**
		 * Triggered when the control's markup has been injected into the DOM.
		 *
		 * @return {void}
		 */
		ready: function() {
			var control = this, newItem;
			if ( 'dropdown-pages' === control.params.type && control.params.allow_addition ) {
				newItem = control.container.find( '.new-content-item-wrapper' );
				newItem.hide(); // Hide in JS to preserve flex display when showing.
				control.container.on( 'click', '.add-new-toggle', function( e ) {
					$( e.currentTarget ).slideUp( 180 );
					newItem.slideDown( 180 );
					newItem.find( '.create-item-input' ).focus();
				});
				control.container.on( 'click', '.add-content', function() {
					control.addNewPage();
				});
				control.container.on( 'keydown', '.create-item-input', function( e ) {
					if ( 13 === e.which ) { // Enter.
						control.addNewPage();
					}
				});
			}
		},

		/**
		 * Get the element inside of a control's container that contains the validation error message.
		 *
		 * Control subclasses may override this to return the proper container to render notifications into.
		 * Injects the notification container for existing controls that lack the necessary container,
		 * including special handling for nav menu items and widgets.
		 *
		 * @since 4.6.0
		 * @return {jQuery} Setting validation message element.
		 */
		getNotificationsContainerElement: function() {
			var control = this, controlTitle, notificationsContainer;

			notificationsContainer = control.container.find( '.customize-control-notifications-container:first' );
			if ( notificationsContainer.length ) {
				return notificationsContainer;
			}

			notificationsContainer = $( '<div class="customize-control-notifications-container"></div>' );

			if ( control.container.hasClass( 'customize-control-nav_menu_item' ) ) {
				control.container.find( '.menu-item-settings:first' ).prepend( notificationsContainer );
			} else if ( control.container.hasClass( 'customize-control-widget_form' ) ) {
				control.container.find( '.widget-inside:first' ).prepend( notificationsContainer );
			} else {
				controlTitle = control.container.find( '.customize-control-title' );
				if ( controlTitle.length ) {
					controlTitle.after( notificationsContainer );
				} else {
					control.container.prepend( notificationsContainer );
				}
			}
			return notificationsContainer;
		},

		/**
		 * Set up notifications.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		setupNotifications: function() {
			var control = this, renderNotificationsIfVisible, onSectionAssigned;

			// Add setting notifications to the control notification.
			_.each( control.settings, function( setting ) {
				if ( ! setting.notifications ) {
					return;
				}
				setting.notifications.bind( 'add', function( settingNotification ) {
					var params = _.extend(
						{},
						settingNotification,
						{
							setting: setting.id
						}
					);
					control.notifications.add( new api.Notification( setting.id + ':' + settingNotification.code, params ) );
				} );
				setting.notifications.bind( 'remove', function( settingNotification ) {
					control.notifications.remove( setting.id + ':' + settingNotification.code );
				} );
			} );

			renderNotificationsIfVisible = function() {
				var sectionId = control.section();
				if ( ! sectionId || ( api.section.has( sectionId ) && api.section( sectionId ).expanded() ) ) {
					control.notifications.render();
				}
			};

			control.notifications.bind( 'rendered', function() {
				var notifications = control.notifications.get();
				control.container.toggleClass( 'has-notifications', 0 !== notifications.length );
				control.container.toggleClass( 'has-error', 0 !== _.where( notifications, { type: 'error' } ).length );
			} );

			onSectionAssigned = function( newSectionId, oldSectionId ) {
				if ( oldSectionId && api.section.has( oldSectionId ) ) {
					api.section( oldSectionId ).expanded.unbind( renderNotificationsIfVisible );
				}
				if ( newSectionId ) {
					api.section( newSectionId, function( section ) {
						section.expanded.bind( renderNotificationsIfVisible );
						renderNotificationsIfVisible();
					});
				}
			};

			control.section.bind( onSectionAssigned );
			onSectionAssigned( control.section.get() );
			control.notifications.bind( 'change', _.debounce( renderNotificationsIfVisible ) );
		},

		/**
		 * Render notifications.
		 *
		 * Renders the `control.notifications` into the control's container.
		 * Control subclasses may override this method to do their own handling
		 * of rendering notifications.
		 *
		 * @deprecated in favor of `control.notifications.render()`
		 * @since 4.6.0
		 * @this {wp.customize.Control}
		 */
		renderNotifications: function() {
			var control = this, container, notifications, hasError = false;

			if ( 'undefined' !== typeof console && console.warn ) {
				console.warn( '[DEPRECATED] wp.customize.Control.prototype.renderNotifications() is deprecated in favor of instantiating a wp.customize.Notifications and calling its render() method.' );
			}

			container = control.getNotificationsContainerElement();
			if ( ! container || ! container.length ) {
				return;
			}
			notifications = [];
			control.notifications.each( function( notification ) {
				notifications.push( notification );
				if ( 'error' === notification.type ) {
					hasError = true;
				}
			} );

			if ( 0 === notifications.length ) {
				container.stop().slideUp( 'fast' );
			} else {
				container.stop().slideDown( 'fast', null, function() {
					$( this ).css( 'height', 'auto' );
				} );
			}

			if ( ! control.notificationsTemplate ) {
				control.notificationsTemplate = wp.template( 'customize-control-notifications' );
			}

			control.container.toggleClass( 'has-notifications', 0 !== notifications.length );
			control.container.toggleClass( 'has-error', hasError );
			container.empty().append(
				control.notificationsTemplate( { notifications: notifications, altNotice: Boolean( control.altNotice ) } ).trim()
			);
		},

		/**
		 * Normal controls do not expand, so just expand its parent
		 *
		 * @param {Object} [params]
		 */
		expand: function ( params ) {
			api.section( this.section() ).expand( params );
		},

		/*
		 * Documented using @borrows in the constructor.
		 */
		focus: focus,

		/**
		 * Update UI in response to a change in the control's active state.
		 * This does not change the active state, it merely handles the behavior
		 * for when it does change.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean}  active
		 * @param {Object}   args
		 * @param {number}   args.duration
		 * @param {Function} args.completeCallback
		 */
		onChangeActive: function ( active, args ) {
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			if ( ! $.contains( document, this.container[0] ) ) {
				// jQuery.fn.slideUp is not hiding an element if it is not in the DOM.
				this.container.toggle( active );
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			} else if ( active ) {
				this.container.slideDown( args.duration, args.completeCallback );
			} else {
				this.container.slideUp( args.duration, args.completeCallback );
			}
		},

		/**
		 * @deprecated 4.1.0 Use this.onChangeActive() instead.
		 */
		toggle: function ( active ) {
			return this.onChangeActive( active, this.defaultActiveArguments );
		},

		/*
		 * Documented using @borrows in the constructor
		 */
		activate: Container.prototype.activate,

		/*
		 * Documented using @borrows in the constructor
		 */
		deactivate: Container.prototype.deactivate,

		/*
		 * Documented using @borrows in the constructor
		 */
		_toggleActive: Container.prototype._toggleActive,

		// @todo This function appears to be dead code and can be removed.
		dropdownInit: function() {
			var control      = this,
				statuses     = this.container.find('.dropdown-status'),
				params       = this.params,
				toggleFreeze = false,
				update       = function( to ) {
					if ( 'string' === typeof to && params.statuses && params.statuses[ to ] ) {
						statuses.html( params.statuses[ to ] ).show();
					} else {
						statuses.hide();
					}
				};

			// Support the .dropdown class to open/close complex elements.
			this.container.on( 'click keydown', '.dropdown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}

				event.preventDefault();

				if ( ! toggleFreeze ) {
					control.container.toggleClass( 'open' );
				}

				if ( control.container.hasClass( 'open' ) ) {
					control.container.parent().parent().find( 'li.library-selected' ).focus();
				}

				// Don't want to fire focus and click at same time.
				toggleFreeze = true;
				setTimeout(function () {
					toggleFreeze = false;
				}, 400);
			});

			this.setting.bind( update );
			update( this.setting() );
		},

		/**
		 * Render the control from its JS template, if it exists.
		 *
		 * The control's container must already exist in the DOM.
		 *
		 * @since 4.1.0
		 */
		renderContent: function () {
			var control = this, template, standardTypes, templateId, sectionId;

			standardTypes = [
				'button',
				'checkbox',
				'date',
				'datetime-local',
				'email',
				'month',
				'number',
				'password',
				'radio',
				'range',
				'search',
				'select',
				'tel',
				'time',
				'text',
				'textarea',
				'week',
				'url'
			];

			templateId = control.templateSelector;

			// Use default content template when a standard HTML type is used,
			// there isn't a more specific template existing, and the control container is empty.
			if ( templateId === 'customize-control-' + control.params.type + '-content' &&
				_.contains( standardTypes, control.params.type ) &&
				! document.getElementById( 'tmpl-' + templateId ) &&
				0 === control.container.children().length )
			{
				templateId = 'customize-control-default-content';
			}

			// Replace the container element's content with the control.
			if ( document.getElementById( 'tmpl-' + templateId ) ) {
				template = wp.template( templateId );
				if ( template && control.container ) {
					control.container.html( template( control.params ) );
				}
			}

			// Re-render notifications after content has been re-rendered.
			control.notifications.container = control.getNotificationsContainerElement();
			sectionId = control.section();
			if ( ! sectionId || ( api.section.has( sectionId ) && api.section( sectionId ).expanded() ) ) {
				control.notifications.render();
			}
		},

		/**
		 * Add a new page to a dropdown-pages control reusing menus code for this.
		 *
		 * @since 4.7.0
		 * @access private
		 *
		 * @return {void}
		 */
		addNewPage: function () {
			var control = this, promise, toggle, container, input, title, select;

			if ( 'dropdown-pages' !== control.params.type || ! control.params.allow_addition || ! api.Menus ) {
				return;
			}

			toggle = control.container.find( '.add-new-toggle' );
			container = control.container.find( '.new-content-item-wrapper' );
			input = control.container.find( '.create-item-input' );
			title = input.val();
			select = control.container.find( 'select' );

			if ( ! title ) {
				input.addClass( 'invalid' );
				return;
			}

			input.removeClass( 'invalid' );
			input.attr( 'disabled', 'disabled' );

			// The menus functions add the page, publish when appropriate,
			// and also add the new page to the dropdown-pages controls.
			promise = api.Menus.insertAutoDraftPost( {
				post_title: title,
				post_type: 'page'
			} );
			promise.done( function( data ) {
				var availableItem, $content, itemTemplate;

				// Prepare the new page as an available menu item.
				// See api.Menus.submitNew().
				availableItem = new api.Menus.AvailableItemModel( {
					'id': 'post-' + data.post_id, // Used for available menu item Backbone models.
					'title': title,
					'type': 'post_type',
					'type_label': api.Menus.data.l10n.page_label,
					'object': 'page',
					'object_id': data.post_id,
					'url': data.url
				} );

				// Add the new item to the list of available menu items.
				api.Menus.availableMenuItemsPanel.collection.add( availableItem );
				$content = $( '#available-menu-items-post_type-page' ).find( '.available-menu-items-list' );
				itemTemplate = wp.template( 'available-menu-item' );
				$content.prepend( itemTemplate( availableItem.attributes ) );

				// Focus the select control.
				select.focus();
				control.setting.set( String( data.post_id ) ); // Triggers a preview refresh and updates the setting.

				// Reset the create page form.
				container.slideUp( 180 );
				toggle.slideDown( 180 );
			} );
			promise.always( function() {
				input.val( '' ).removeAttr( 'disabled' );
			} );
		}
	});

	/**
	 * A colorpicker control.
	 *
	 * @class    wp.customize.ColorControl
	 * @augments wp.customize.Control
	 */
	api.ColorControl = api.Control.extend(/** @lends wp.customize.ColorControl.prototype */{
		ready: function() {
			var control = this,
				isHueSlider = this.params.mode === 'hue',
				updating = false,
				picker;

			if ( isHueSlider ) {
				picker = this.container.find( '.color-picker-hue' );
				picker.val( control.setting() ).wpColorPicker({
					change: function( event, ui ) {
						updating = true;
						control.setting( ui.color.h() );
						updating = false;
					}
				});
			} else {
				picker = this.container.find( '.color-picker-hex' );
				picker.val( control.setting() ).wpColorPicker({
					change: function() {
						updating = true;
						control.setting.set( picker.wpColorPicker( 'color' ) );
						updating = false;
					},
					clear: function() {
						updating = true;
						control.setting.set( '' );
						updating = false;
					}
				});
			}

			control.setting.bind( function ( value ) {
				// Bail if the update came from the control itself.
				if ( updating ) {
					return;
				}
				picker.val( value );
				picker.wpColorPicker( 'color', value );
			} );

			// Collapse color picker when hitting Esc instead of collapsing the current section.
			control.container.on( 'keydown', function( event ) {
				var pickerContainer;
				if ( 27 !== event.which ) { // Esc.
					return;
				}
				pickerContainer = control.container.find( '.wp-picker-container' );
				if ( pickerContainer.hasClass( 'wp-picker-active' ) ) {
					picker.wpColorPicker( 'close' );
					control.container.find( '.wp-color-result' ).focus();
					event.stopPropagation(); // Prevent section from being collapsed.
				}
			} );
		}
	});

	/**
	 * A control that implements the media modal.
	 *
	 * @class    wp.customize.MediaControl
	 * @augments wp.customize.Control
	 */
	api.MediaControl = api.Control.extend(/** @lends wp.customize.MediaControl.prototype */{

		/**
		 * When the control's DOM structure is ready,
		 * set up internal event bindings.
		 */
		ready: function() {
			var control = this;
			// Shortcut so that we don't have to use _.bind every time we add a callback.
			_.bindAll( control, 'restoreDefault', 'removeFile', 'openFrame', 'select', 'pausePlayer' );

			// Bind events, with delegation to facilitate re-rendering.
			control.container.on( 'click keydown', '.upload-button', control.openFrame );
			control.container.on( 'click keydown', '.upload-button', control.pausePlayer );
			control.container.on( 'click keydown', '.thumbnail-image img', control.openFrame );
			control.container.on( 'click keydown', '.default-button', control.restoreDefault );
			control.container.on( 'click keydown', '.remove-button', control.pausePlayer );
			control.container.on( 'click keydown', '.remove-button', control.removeFile );
			control.container.on( 'click keydown', '.remove-button', control.cleanupPlayer );

			// Resize the player controls when it becomes visible (ie when section is expanded).
			api.section( control.section() ).container
				.on( 'expanded', function() {
					if ( control.player ) {
						control.player.setControlsSize();
					}
				})
				.on( 'collapsed', function() {
					control.pausePlayer();
				});

			/**
			 * Set attachment data and render content.
			 *
			 * Note that BackgroundImage.prototype.ready applies this ready method
			 * to itself. Since BackgroundImage is an UploadControl, the value
			 * is the attachment URL instead of the attachment ID. In this case
			 * we skip fetching the attachment data because we have no ID available,
			 * and it is the responsibility of the UploadControl to set the control's
			 * attachmentData before calling the renderContent method.
			 *
			 * @param {number|string} value Attachment
			 */
			function setAttachmentDataAndRenderContent( value ) {
				var hasAttachmentData = $.Deferred();

				if ( control.extended( api.UploadControl ) ) {
					hasAttachmentData.resolve();
				} else {
					value = parseInt( value, 10 );
					if ( _.isNaN( value ) || value <= 0 ) {
						delete control.params.attachment;
						hasAttachmentData.resolve();
					} else if ( control.params.attachment && control.params.attachment.id === value ) {
						hasAttachmentData.resolve();
					}
				}

				// Fetch the attachment data.
				if ( 'pending' === hasAttachmentData.state() ) {
					wp.media.attachment( value ).fetch().done( function() {
						control.params.attachment = this.attributes;
						hasAttachmentData.resolve();

						// Send attachment information to the preview for possible use in `postMessage` transport.
						wp.customize.previewer.send( control.setting.id + '-attachment-data', this.attributes );
					} );
				}

				hasAttachmentData.done( function() {
					control.renderContent();
				} );
			}

			// Ensure attachment data is initially set (for dynamically-instantiated controls).
			setAttachmentDataAndRenderContent( control.setting() );

			// Update the attachment data and re-render the control when the setting changes.
			control.setting.bind( setAttachmentDataAndRenderContent );
		},

		pausePlayer: function () {
			this.player && this.player.pause();
		},

		cleanupPlayer: function () {
			this.player && wp.media.mixin.removePlayer( this.player );
		},

		/**
		 * Open the media modal.
		 */
		openFrame: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}

			event.preventDefault();

			if ( ! this.frame ) {
				this.initFrame();
			}

			this.frame.open();
		},

		/**
		 * Create a media modal select frame, and store it so the instance can be reused when needed.
		 */
		initFrame: function() {
			this.frame = wp.media({
				button: {
					text: this.params.button_labels.frame_button
				},
				states: [
					new wp.media.controller.Library({
						title:     this.params.button_labels.frame_title,
						library:   wp.media.query({ type: this.params.mime_type }),
						multiple:  false,
						date:      false
					})
				]
			});

			// When a file is selected, run a callback.
			this.frame.on( 'select', this.select );
		},

		/**
		 * Callback handler for when an attachment is selected in the media modal.
		 * Gets the selected image information, and sets it within the control.
		 */
		select: function() {
			// Get the attachment from the modal frame.
			var node,
				attachment = this.frame.state().get( 'selection' ).first().toJSON(),
				mejsSettings = window._wpmejsSettings || {};

			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.id );
			node = this.container.find( 'audio, video' ).get(0);

			// Initialize audio/video previews.
			if ( node ) {
				this.player = new MediaElementPlayer( node, mejsSettings );
			} else {
				this.cleanupPlayer();
			}
		},

		/**
		 * Reset the setting to the default value.
		 */
		restoreDefault: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}
			event.preventDefault();

			this.params.attachment = this.params.defaultAttachment;
			this.setting( this.params.defaultAttachment.url );
		},

		/**
		 * Called when the "Remove" link is clicked. Empties the setting.
		 *
		 * @param {Object} event jQuery Event object
		 */
		removeFile: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}
			event.preventDefault();

			this.params.attachment = {};
			this.setting( '' );
			this.renderContent(); // Not bound to setting change when emptying.
		}
	});

	/**
	 * An upload control, which utilizes the media modal.
	 *
	 * @class    wp.customize.UploadControl
	 * @augments wp.customize.MediaControl
	 */
	api.UploadControl = api.MediaControl.extend(/** @lends wp.customize.UploadControl.prototype */{

		/**
		 * Callback handler for when an attachment is selected in the media modal.
		 * Gets the selected image information, and sets it within the control.
		 */
		select: function() {
			// Get the attachment from the modal frame.
			var node,
				attachment = this.frame.state().get( 'selection' ).first().toJSON(),
				mejsSettings = window._wpmejsSettings || {};

			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.url );
			node = this.container.find( 'audio, video' ).get(0);

			// Initialize audio/video previews.
			if ( node ) {
				this.player = new MediaElementPlayer( node, mejsSettings );
			} else {
				this.cleanupPlayer();
			}
		},

		// @deprecated
		success: function() {},

		// @deprecated
		removerVisibility: function() {}
	});

	/**
	 * A control for uploading images.
	 *
	 * This control no longer needs to do anything more
	 * than what the upload control does in JS.
	 *
	 * @class    wp.customize.ImageControl
	 * @augments wp.customize.UploadControl
	 */
	api.ImageControl = api.UploadControl.extend(/** @lends wp.customize.ImageControl.prototype */{
		// @deprecated
		thumbnailSrc: function() {}
	});

	/**
	 * A control for uploading background images.
	 *
	 * @class    wp.customize.BackgroundControl
	 * @augments wp.customize.UploadControl
	 */
	api.BackgroundControl = api.UploadControl.extend(/** @lends wp.customize.BackgroundControl.prototype */{

		/**
		 * When the control's DOM structure is ready,
		 * set up internal event bindings.
		 */
		ready: function() {
			api.UploadControl.prototype.ready.apply( this, arguments );
		},

		/**
		 * Callback handler for when an attachment is selected in the media modal.
		 * Does an additional Ajax request for setting the background context.
		 */
		select: function() {
			api.UploadControl.prototype.select.apply( this, arguments );

			wp.ajax.post( 'custom-background-add', {
				nonce: _wpCustomizeBackground.nonces.add,
				wp_customize: 'on',
				customize_theme: api.settings.theme.stylesheet,
				attachment_id: this.params.attachment.id
			} );
		}
	});

	/**
	 * A control for positioning a background image.
	 *
	 * @since 4.7.0
	 *
	 * @class    wp.customize.BackgroundPositionControl
	 * @augments wp.customize.Control
	 */
	api.BackgroundPositionControl = api.Control.extend(/** @lends wp.customize.BackgroundPositionControl.prototype */{

		/**
		 * Set up control UI once embedded in DOM and settings are created.
		 *
		 * @since 4.7.0
		 * @access public
		 */
		ready: function() {
			var control = this, updateRadios;

			control.container.on( 'change', 'input[name="background-position"]', function() {
				var position = $( this ).val().split( ' ' );
				control.settings.x( position[0] );
				control.settings.y( position[1] );
			} );

			updateRadios = _.debounce( function() {
				var x, y, radioInput, inputValue;
				x = control.settings.x.get();
				y = control.settings.y.get();
				inputValue = String( x ) + ' ' + String( y );
				radioInput = control.container.find( 'input[name="background-position"][value="' + inputValue + '"]' );
				radioInput.trigger( 'click' );
			} );
			control.settings.x.bind( updateRadios );
			control.settings.y.bind( updateRadios );

			updateRadios(); // Set initial UI.
		}
	} );

	/**
	 * A control for selecting and cropping an image.
	 *
	 * @class    wp.customize.CroppedImageControl
	 * @augments wp.customize.MediaControl
	 */
	api.CroppedImageControl = api.MediaControl.extend(/** @lends wp.customize.CroppedImageControl.prototype */{

		/**
		 * Open the media modal to the library state.
		 */
		openFrame: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}

			this.initFrame();
			this.frame.setState( 'library' ).open();
		},

		/**
		 * Create a media modal select frame, and store it so the instance can be reused when needed.
		 */
		initFrame: function() {
			var l10n = _wpMediaViewsL10n;

			this.frame = wp.media({
				button: {
					text: l10n.select,
					close: false
				},
				states: [
					new wp.media.controller.Library({
						title: this.params.button_labels.frame_title,
						library: wp.media.query({ type: 'image' }),
						multiple: false,
						date: false,
						priority: 20,
						suggestedWidth: this.params.width,
						suggestedHeight: this.params.height
					}),
					new wp.media.controller.CustomizeImageCropper({
						imgSelectOptions: this.calculateImageSelectOptions,
						control: this
					})
				]
			});

			this.frame.on( 'select', this.onSelect, this );
			this.frame.on( 'cropped', this.onCropped, this );
			this.frame.on( 'skippedcrop', this.onSkippedCrop, this );
		},

		/**
		 * After an image is selected in the media modal, switch to the cropper
		 * state if the image isn't the right size.
		 */
		onSelect: function() {
			var attachment = this.frame.state().get( 'selection' ).first().toJSON();

			if ( this.params.width === attachment.width && this.params.height === attachment.height && ! this.params.flex_width && ! this.params.flex_height ) {
				this.setImageFromAttachment( attachment );
				this.frame.close();
			} else {
				this.frame.setState( 'cropper' );
			}
		},

		/**
		 * After the image has been cropped, apply the cropped image data to the setting.
		 *
		 * @param {Object} croppedImage Cropped attachment data.
		 */
		onCropped: function( croppedImage ) {
			this.setImageFromAttachment( croppedImage );
		},

		/**
		 * Returns a set of options, computed from the attached image data and
		 * control-specific data, to be fed to the imgAreaSelect plugin in
		 * wp.media.view.Cropper.
		 *
		 * @param {wp.media.model.Attachment} attachment
		 * @param {wp.media.controller.Cropper} controller
		 * @return {Object} Options
		 */
		calculateImageSelectOptions: function( attachment, controller ) {
			var control       = controller.get( 'control' ),
				flexWidth     = !! parseInt( control.params.flex_width, 10 ),
				flexHeight    = !! parseInt( control.params.flex_height, 10 ),
				realWidth     = attachment.get( 'width' ),
				realHeight    = attachment.get( 'height' ),
				xInit         = parseInt( control.params.width, 10 ),
				yInit         = parseInt( control.params.height, 10 ),
				requiredRatio = xInit / yInit,
				realRatio     = realWidth / realHeight,
				xImg          = xInit,
				yImg          = yInit,
				x1, y1, imgSelectOptions;

			controller.set( 'hasRequiredAspectRatio', control.hasRequiredAspectRatio( requiredRatio, realRatio ) );
			controller.set( 'suggestedCropSize', { width: realWidth, height: realHeight, x1: 0, y1: 0, x2: xInit, y2: yInit } );
			controller.set( 'canSkipCrop', ! control.mustBeCropped( flexWidth, flexHeight, xInit, yInit, realWidth, realHeight ) );

			if ( realRatio > requiredRatio ) {
				yInit = realHeight;
				xInit = yInit * requiredRatio;
			} else {
				xInit = realWidth;
				yInit = xInit / requiredRatio;
			}

			x1 = ( realWidth - xInit ) / 2;
			y1 = ( realHeight - yInit ) / 2;

			imgSelectOptions = {
				handles: true,
				keys: true,
				instance: true,
				persistent: true,
				imageWidth: realWidth,
				imageHeight: realHeight,
				minWidth: xImg > xInit ? xInit : xImg,
				minHeight: yImg > yInit ? yInit : yImg,
				x1: x1,
				y1: y1,
				x2: xInit + x1,
				y2: yInit + y1
			};

			if ( flexHeight === false && flexWidth === false ) {
				imgSelectOptions.aspectRatio = xInit + ':' + yInit;
			}

			if ( true === flexHeight ) {
				delete imgSelectOptions.minHeight;
				imgSelectOptions.maxWidth = realWidth;
			}

			if ( true === flexWidth ) {
				delete imgSelectOptions.minWidth;
				imgSelectOptions.maxHeight = realHeight;
			}

			return imgSelectOptions;
		},

		/**
		 * Return whether the image must be cropped, based on required dimensions.
		 *
		 * @param {boolean} flexW Width is flexible.
		 * @param {boolean} flexH Height is flexible.
		 * @param {number}  dstW  Required width.
		 * @param {number}  dstH  Required height.
		 * @param {number}  imgW  Provided image's width.
		 * @param {number}  imgH  Provided image's height.
		 * @return {boolean} Whether cropping is required.
		 */
		mustBeCropped: function( flexW, flexH, dstW, dstH, imgW, imgH ) {
			if ( true === flexW && true === flexH ) {
				return false;
			}

			if ( true === flexW && dstH === imgH ) {
				return false;
			}

			if ( true === flexH && dstW === imgW ) {
				return false;
			}

			if ( dstW === imgW && dstH === imgH ) {
				return false;
			}

			if ( imgW <= dstW ) {
				return false;
			}

			return true;
		},

		/**
		 * Check if the image's aspect ratio essentially matches the required aspect ratio.
		 *
		 * Floating point precision is low, so this allows a small tolerance. This
		 * tolerance allows for images over 100,000 px on either side to still trigger
		 * the cropping flow.
		 *
		 * @param {number} requiredRatio Required image ratio.
		 * @param {number} realRatio     Provided image ratio.
		 * @return {boolean} Whether the image has the required aspect ratio.
		 */
		hasRequiredAspectRatio: function ( requiredRatio, realRatio ) {
			if ( Math.abs( requiredRatio - realRatio ) < 0.000001 ) {
				return true;
			}

			return false;
		},

		/**
		 * If cropping was skipped, apply the image data directly to the setting.
		 */
		onSkippedCrop: function() {
			var attachment = this.frame.state().get( 'selection' ).first().toJSON();
			this.setImageFromAttachment( attachment );
		},

		/**
		 * Updates the setting and re-renders the control UI.
		 *
		 * @param {Object} attachment
		 */
		setImageFromAttachment: function( attachment ) {
			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.id );
		}
	});

	/**
	 * A control for selecting and cropping Site Icons.
	 *
	 * @class    wp.customize.SiteIconControl
	 * @augments wp.customize.CroppedImageControl
	 */
	api.SiteIconControl = api.CroppedImageControl.extend(/** @lends wp.customize.SiteIconControl.prototype */{

		/**
		 * Create a media modal select frame, and store it so the instance can be reused when needed.
		 */
		initFrame: function() {
			var l10n = _wpMediaViewsL10n;

			this.frame = wp.media({
				button: {
					text: l10n.select,
					close: false
				},
				states: [
					new wp.media.controller.Library({
						title: this.params.button_labels.frame_title,
						library: wp.media.query({ type: 'image' }),
						multiple: false,
						date: false,
						priority: 20,
						suggestedWidth: this.params.width,
						suggestedHeight: this.params.height
					}),
					new wp.media.controller.SiteIconCropper({
						imgSelectOptions: this.calculateImageSelectOptions,
						control: this
					})
				]
			});

			this.frame.on( 'select', this.onSelect, this );
			this.frame.on( 'cropped', this.onCropped, this );
			this.frame.on( 'skippedcrop', this.onSkippedCrop, this );
		},

		/**
		 * After an image is selected in the media modal, switch to the cropper
		 * state if the image isn't the right size.
		 */
		onSelect: function() {
			var attachment = this.frame.state().get( 'selection' ).first().toJSON(),
				controller = this;

			if ( this.params.width === attachment.width && this.params.height === attachment.height && ! this.params.flex_width && ! this.params.flex_height ) {
				wp.ajax.post( 'crop-image', {
					nonce: attachment.nonces.edit,
					id: attachment.id,
					context: 'site-icon',
					cropDetails: {
						x1: 0,
						y1: 0,
						width: this.params.width,
						height: this.params.height,
						dst_width: this.params.width,
						dst_height: this.params.height
					}
				} ).done( function( croppedImage ) {
					controller.setImageFromAttachment( croppedImage );
					controller.frame.close();
				} ).fail( function() {
					controller.frame.trigger('content:error:crop');
				} );
			} else {
				this.frame.setState( 'cropper' );
			}
		},

		/**
		 * Updates the setting and re-renders the control UI.
		 *
		 * @param {Object} attachment
		 */
		setImageFromAttachment: function( attachment ) {
			var sizes = [ 'site_icon-32', 'thumbnail', 'full' ], link,
				icon;

			_.each( sizes, function( size ) {
				if ( ! icon && ! _.isUndefined ( attachment.sizes[ size ] ) ) {
					icon = attachment.sizes[ size ];
				}
			} );

			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.id );

			if ( ! icon ) {
				return;
			}

			// Update the icon in-browser.
			link = $( 'link[rel="icon"][sizes="32x32"]' );
			link.attr( 'href', icon.url );
		},

		/**
		 * Called when the "Remove" link is clicked. Empties the setting.
		 *
		 * @param {Object} event jQuery Event object
		 */
		removeFile: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}
			event.preventDefault();

			this.params.attachment = {};
			this.setting( '' );
			this.renderContent(); // Not bound to setting change when emptying.
			$( 'link[rel="icon"][sizes="32x32"]' ).attr( 'href', '/favicon.ico' ); // Set to default.
		}
	});

	/**
	 * @class    wp.customize.HeaderControl
	 * @augments wp.customize.Control
	 */
	api.HeaderControl = api.Control.extend(/** @lends wp.customize.HeaderControl.prototype */{
		ready: function() {
			this.btnRemove = $('#customize-control-header_image .actions .remove');
			this.btnNew    = $('#customize-control-header_image .actions .new');

			_.bindAll(this, 'openMedia', 'removeImage');

			this.btnNew.on( 'click', this.openMedia );
			this.btnRemove.on( 'click', this.removeImage );

			api.HeaderTool.currentHeader = this.getInitialHeaderImage();

			new api.HeaderTool.CurrentView({
				model: api.HeaderTool.currentHeader,
				el: '#customize-control-header_image .current .container'
			});

			new api.HeaderTool.ChoiceListView({
				collection: api.HeaderTool.UploadsList = new api.HeaderTool.ChoiceList(),
				el: '#customize-control-header_image .choices .uploaded .list'
			});

			new api.HeaderTool.ChoiceListView({
				collection: api.HeaderTool.DefaultsList = new api.HeaderTool.DefaultsList(),
				el: '#customize-control-header_image .choices .default .list'
			});

			api.HeaderTool.combinedList = api.HeaderTool.CombinedList = new api.HeaderTool.CombinedList([
				api.HeaderTool.UploadsList,
				api.HeaderTool.DefaultsList
			]);

			// Ensure custom-header-crop Ajax requests bootstrap the Customizer to activate the previewed theme.
			wp.media.controller.Cropper.prototype.defaults.doCropArgs.wp_customize = 'on';
			wp.media.controller.Cropper.prototype.defaults.doCropArgs.customize_theme = api.settings.theme.stylesheet;
		},

		/**
		 * Returns a new instance of api.HeaderTool.ImageModel based on the currently
		 * saved header image (if any).
		 *
		 * @since 4.2.0
		 *
		 * @return {Object} Options
		 */
		getInitialHeaderImage: function() {
			if ( ! api.get().header_image || ! api.get().header_image_data || _.contains( [ 'remove-header', 'random-default-image', 'random-uploaded-image' ], api.get().header_image ) ) {
				return new api.HeaderTool.ImageModel();
			}

			// Get the matching uploaded image object.
			var currentHeaderObject = _.find( _wpCustomizeHeader.uploads, function( imageObj ) {
				return ( imageObj.attachment_id === api.get().header_image_data.attachment_id );
			} );
			// Fall back to raw current header image.
			if ( ! currentHeaderObject ) {
				currentHeaderObject = {
					url: api.get().header_image,
					thumbnail_url: api.get().header_image,
					attachment_id: api.get().header_image_data.attachment_id
				};
			}

			return new api.HeaderTool.ImageModel({
				header: currentHeaderObject,
				choice: currentHeaderObject.url.split( '/' ).pop()
			});
		},

		/**
		 * Returns a set of options, computed from the attached image data and
		 * theme-specific data, to be fed to the imgAreaSelect plugin in
		 * wp.media.view.Cropper.
		 *
		 * @param {wp.media.model.Attachment} attachment
		 * @param {wp.media.controller.Cropper} controller
		 * @return {Object} Options
		 */
		calculateImageSelectOptions: function(attachment, controller) {
			var xInit = parseInt(_wpCustomizeHeader.data.width, 10),
				yInit = parseInt(_wpCustomizeHeader.data.height, 10),
				flexWidth = !! parseInt(_wpCustomizeHeader.data['flex-width'], 10),
				flexHeight = !! parseInt(_wpCustomizeHeader.data['flex-height'], 10),
				ratio, xImg, yImg, realHeight, realWidth,
				imgSelectOptions;

			realWidth = attachment.get('width');
			realHeight = attachment.get('height');

			this.headerImage = new api.HeaderTool.ImageModel();
			this.headerImage.set({
				themeWidth: xInit,
				themeHeight: yInit,
				themeFlexWidth: flexWidth,
				themeFlexHeight: flexHeight,
				imageWidth: realWidth,
				imageHeight: realHeight
			});

			controller.set( 'canSkipCrop', ! this.headerImage.shouldBeCropped() );

			ratio = xInit / yInit;
			xImg = realWidth;
			yImg = realHeight;

			if ( xImg / yImg > ratio ) {
				yInit = yImg;
				xInit = yInit * ratio;
			} else {
				xInit = xImg;
				yInit = xInit / ratio;
			}

			imgSelectOptions = {
				handles: true,
				keys: true,
				instance: true,
				persistent: true,
				imageWidth: realWidth,
				imageHeight: realHeight,
				x1: 0,
				y1: 0,
				x2: xInit,
				y2: yInit
			};

			if (flexHeight === false && flexWidth === false) {
				imgSelectOptions.aspectRatio = xInit + ':' + yInit;
			}
			if (flexHeight === false ) {
				imgSelectOptions.maxHeight = yInit;
			}
			if (flexWidth === false ) {
				imgSelectOptions.maxWidth = xInit;
			}

			return imgSelectOptions;
		},

		/**
		 * Sets up and opens the Media Manager in order to select an image.
		 * Depending on both the size of the image and the properties of the
		 * current theme, a cropping step after selection may be required or
		 * skippable.
		 *
		 * @param {event} event
		 */
		openMedia: function(event) {
			var l10n = _wpMediaViewsL10n;

			event.preventDefault();

			this.frame = wp.media({
				button: {
					text: l10n.selectAndCrop,
					close: false
				},
				states: [
					new wp.media.controller.Library({
						title:     l10n.chooseImage,
						library:   wp.media.query({ type: 'image' }),
						multiple:  false,
						date:      false,
						priority:  20,
						suggestedWidth: _wpCustomizeHeader.data.width,
						suggestedHeight: _wpCustomizeHeader.data.height
					}),
					new wp.media.controller.Cropper({
						imgSelectOptions: this.calculateImageSelectOptions
					})
				]
			});

			this.frame.on('select', this.onSelect, this);
			this.frame.on('cropped', this.onCropped, this);
			this.frame.on('skippedcrop', this.onSkippedCrop, this);

			this.frame.open();
		},

		/**
		 * After an image is selected in the media modal,
		 * switch to the cropper state.
		 */
		onSelect: function() {
			this.frame.setState('cropper');
		},

		/**
		 * After the image has been cropped, apply the cropped image data to the setting.
		 *
		 * @param {Object} croppedImage Cropped attachment data.
		 */
		onCropped: function(croppedImage) {
			var url = croppedImage.url,
				attachmentId = croppedImage.attachment_id,
				w = croppedImage.width,
				h = croppedImage.height;
			this.setImageFromURL(url, attachmentId, w, h);
		},

		/**
		 * If cropping was skipped, apply the image data directly to the setting.
		 *
		 * @param {Object} selection
		 */
		onSkippedCrop: function(selection) {
			var url = selection.get('url'),
				w = selection.get('width'),
				h = selection.get('height');
			this.setImageFromURL(url, selection.id, w, h);
		},

		/**
		 * Creates a new wp.customize.HeaderTool.ImageModel from provided
		 * header image data and inserts it into the user-uploaded headers
		 * collection.
		 *
		 * @param {string} url
		 * @param {number} attachmentId
		 * @param {number} width
		 * @param {number} height
		 */
		setImageFromURL: function(url, attachmentId, width, height) {
			var choice, data = {};

			data.url = url;
			data.thumbnail_url = url;
			data.timestamp = _.now();

			if (attachmentId) {
				data.attachment_id = attachmentId;
			}

			if (width) {
				data.width = width;
			}

			if (height) {
				data.height = height;
			}

			choice = new api.HeaderTool.ImageModel({
				header: data,
				choice: url.split('/').pop()
			});
			api.HeaderTool.UploadsList.add(choice);
			api.HeaderTool.currentHeader.set(choice.toJSON());
			choice.save();
			choice.importImage();
		},

		/**
		 * Triggers the necessary events to deselect an image which was set as
		 * the currently selected one.
		 */
		removeImage: function() {
			api.HeaderTool.currentHeader.trigger('hide');
			api.HeaderTool.CombinedList.trigger('control:removeImage');
		}

	});

	/**
	 * wp.customize.ThemeControl
	 *
	 * @class    wp.customize.ThemeControl
	 * @augments wp.customize.Control
	 */
	api.ThemeControl = api.Control.extend(/** @lends wp.customize.ThemeControl.prototype */{

		touchDrag: false,
		screenshotRendered: false,

		/**
		 * @since 4.2.0
		 */
		ready: function() {
			var control = this, panel = api.panel( 'themes' );

			function disableSwitchButtons() {
				return ! panel.canSwitchTheme( control.params.theme.id );
			}

			// Temporary special function since supplying SFTP credentials does not work yet. See #42184.
			function disableInstallButtons() {
				return disableSwitchButtons() || false === api.settings.theme._canInstall || true === api.settings.theme._filesystemCredentialsNeeded;
			}
			function updateButtons() {
				control.container.find( 'button.preview, button.preview-theme' ).toggleClass( 'disabled', disableSwitchButtons() );
				control.container.find( 'button.theme-install' ).toggleClass( 'disabled', disableInstallButtons() );
			}

			api.state( 'selectedChangesetStatus' ).bind( updateButtons );
			api.state( 'changesetStatus' ).bind( updateButtons );
			updateButtons();

			control.container.on( 'touchmove', '.theme', function() {
				control.touchDrag = true;
			});

			// Bind details view trigger.
			control.container.on( 'click keydown touchend', '.theme', function( event ) {
				var section;
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}

				// Bail if the user scrolled on a touch device.
				if ( control.touchDrag === true ) {
					return control.touchDrag = false;
				}

				// Prevent the modal from showing when the user clicks the action button.
				if ( $( event.target ).is( '.theme-actions .button, .update-theme' ) ) {
					return;
				}

				event.preventDefault(); // Keep this AFTER the key filter above.
				section = api.section( control.section() );
				section.showDetails( control.params.theme, function() {

					// Temporary special function since supplying SFTP credentials does not work yet. See #42184.
					if ( api.settings.theme._filesystemCredentialsNeeded ) {
						section.overlay.find( '.theme-actions .delete-theme' ).remove();
					}
				} );
			});

			control.container.on( 'render-screenshot', function() {
				var $screenshot = $( this ).find( 'img' ),
					source = $screenshot.data( 'src' );

				if ( source ) {
					$screenshot.attr( 'src', source );
				}
				control.screenshotRendered = true;
			});
		},

		/**
		 * Show or hide the theme based on the presence of the term in the title, description, tags, and author.
		 *
		 * @since 4.2.0
		 * @param {Array} terms - An array of terms to search for.
		 * @return {boolean} Whether a theme control was activated or not.
		 */
		filter: function( terms ) {
			var control = this,
				matchCount = 0,
				haystack = control.params.theme.name + ' ' +
					control.params.theme.description + ' ' +
					control.params.theme.tags + ' ' +
					control.params.theme.author + ' ';
			haystack = haystack.toLowerCase().replace( '-', ' ' );

			// Back-compat for behavior in WordPress 4.2.0 to 4.8.X.
			if ( ! _.isArray( terms ) ) {
				terms = [ terms ];
			}

			// Always give exact name matches highest ranking.
			if ( control.params.theme.name.toLowerCase() === terms.join( ' ' ) ) {
				matchCount = 100;
			} else {

				// Search for and weight (by 10) complete term matches.
				matchCount = matchCount + 10 * ( haystack.split( terms.join( ' ' ) ).length - 1 );

				// Search for each term individually (as whole-word and partial match) and sum weighted match counts.
				_.each( terms, function( term ) {
					matchCount = matchCount + 2 * ( haystack.split( term + ' ' ).length - 1 ); // Whole-word, double-weighted.
					matchCount = matchCount + haystack.split( term ).length - 1; // Partial word, to minimize empty intermediate searches while typing.
				});

				// Upper limit on match ranking.
				if ( matchCount > 99 ) {
					matchCount = 99;
				}
			}

			if ( 0 !== matchCount ) {
				control.activate();
				control.params.priority = 101 - matchCount; // Sort results by match count.
				return true;
			} else {
				control.deactivate(); // Hide control.
				control.params.priority = 101;
				return false;
			}
		},

		/**
		 * Rerender the theme from its JS template with the installed type.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		rerenderAsInstalled: function( installed ) {
			var control = this, section;
			if ( installed ) {
				control.params.theme.type = 'installed';
			} else {
				section = api.section( control.params.section );
				control.params.theme.type = section.params.action;
			}
			control.renderContent(); // Replaces existing content.
			control.container.trigger( 'render-screenshot' );
		}
	});

	/**
	 * Class wp.customize.CodeEditorControl
	 *
	 * @since 4.9.0
	 *
	 * @class    wp.customize.CodeEditorControl
	 * @augments wp.customize.Control
	 */
	api.CodeEditorControl = api.Control.extend(/** @lends wp.customize.CodeEditorControl.prototype */{

		/**
		 * Initialize.
		 *
		 * @since 4.9.0
		 * @param {string} id      - Unique identifier for the control instance.
		 * @param {Object} options - Options hash for the control instance.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var control = this;
			control.deferred = _.extend( control.deferred || {}, {
				codemirror: $.Deferred()
			} );
			api.Control.prototype.initialize.call( control, id, options );

			// Note that rendering is debounced so the props will be used when rendering happens after add event.
			control.notifications.bind( 'add', function( notification ) {

				// Skip if control notification is not from setting csslint_error notification.
				if ( notification.code !== control.setting.id + ':csslint_error' ) {
					return;
				}

				// Customize the template and behavior of csslint_error notifications.
				notification.templateId = 'customize-code-editor-lint-error-notification';
				notification.render = (function( render ) {
					return function() {
						var li = render.call( this );
						li.find( 'input[type=checkbox]' ).on( 'click', function() {
							control.setting.notifications.remove( 'csslint_error' );
						} );
						return li;
					};
				})( notification.render );
			} );
		},

		/**
		 * Initialize the editor when the containing section is ready and expanded.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		ready: function() {
			var control = this;
			if ( ! control.section() ) {
				control.initEditor();
				return;
			}

			// Wait to initialize editor until section is embedded and expanded.
			api.section( control.section(), function( section ) {
				section.deferred.embedded.done( function() {
					var onceExpanded;
					if ( section.expanded() ) {
						control.initEditor();
					} else {
						onceExpanded = function( isExpanded ) {
							if ( isExpanded ) {
								control.initEditor();
								section.expanded.unbind( onceExpanded );
							}
						};
						section.expanded.bind( onceExpanded );
					}
				} );
			} );
		},

		/**
		 * Initialize editor.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		initEditor: function() {
			var control = this, element, editorSettings = false;

			// Obtain editorSettings for instantiation.
			if ( wp.codeEditor && ( _.isUndefined( control.params.editor_settings ) || false !== control.params.editor_settings ) ) {

				// Obtain default editor settings.
				editorSettings = wp.codeEditor.defaultSettings ? _.clone( wp.codeEditor.defaultSettings ) : {};
				editorSettings.codemirror = _.extend(
					{},
					editorSettings.codemirror,
					{
						indentUnit: 2,
						tabSize: 2
					}
				);

				// Merge editor_settings param on top of defaults.
				if ( _.isObject( control.params.editor_settings ) ) {
					_.each( control.params.editor_settings, function( value, key ) {
						if ( _.isObject( value ) ) {
							editorSettings[ key ] = _.extend(
								{},
								editorSettings[ key ],
								value
							);
						}
					} );
				}
			}

			element = new api.Element( control.container.find( 'textarea' ) );
			control.elements.push( element );
			element.sync( control.setting );
			element.set( control.setting() );

			if ( editorSettings ) {
				control.initSyntaxHighlightingEditor( editorSettings );
			} else {
				control.initPlainTextareaEditor();
			}
		},

		/**
		 * Make sure editor gets focused when control is focused.
		 *
		 * @since 4.9.0
		 * @param {Object}   [params] - Focus params.
		 * @param {Function} [params.completeCallback] - Function to call when expansion is complete.
		 * @return {void}
		 */
		focus: function( params ) {
			var control = this, extendedParams = _.extend( {}, params ), originalCompleteCallback;
			originalCompleteCallback = extendedParams.completeCallback;
			extendedParams.completeCallback = function() {
				if ( originalCompleteCallback ) {
					originalCompleteCallback();
				}
				if ( control.editor ) {
					control.editor.codemirror.focus();
				}
			};
			api.Control.prototype.focus.call( control, extendedParams );
		},

		/**
		 * Initialize syntax-highlighting editor.
		 *
		 * @since 4.9.0
		 * @param {Object} codeEditorSettings - Code editor settings.
		 * @return {void}
		 */
		initSyntaxHighlightingEditor: function( codeEditorSettings ) {
			var control = this, $textarea = control.container.find( 'textarea' ), settings, suspendEditorUpdate = false;

			settings = _.extend( {}, codeEditorSettings, {
				onTabNext: _.bind( control.onTabNext, control ),
				onTabPrevious: _.bind( control.onTabPrevious, control ),
				onUpdateErrorNotice: _.bind( control.onUpdateErrorNotice, control )
			});

			control.editor = wp.codeEditor.initialize( $textarea, settings );

			// Improve the editor accessibility.
			$( control.editor.codemirror.display.lineDiv )
				.attr({
					role: 'textbox',
					'aria-multiline': 'true',
					'aria-label': control.params.label,
					'aria-describedby': 'editor-keyboard-trap-help-1 editor-keyboard-trap-help-2 editor-keyboard-trap-help-3 editor-keyboard-trap-help-4'
				});

			// Focus the editor when clicking on its label.
			control.container.find( 'label' ).on( 'click', function() {
				control.editor.codemirror.focus();
			});

			/*
			 * When the CodeMirror instance changes, mirror to the textarea,
			 * where we have our "true" change event handler bound.
			 */
			control.editor.codemirror.on( 'change', function( codemirror ) {
				suspendEditorUpdate = true;
				$textarea.val( codemirror.getValue() ).trigger( 'change' );
				suspendEditorUpdate = false;
			});

			// Update CodeMirror when the setting is changed by another plugin.
			control.setting.bind( function( value ) {
				if ( ! suspendEditorUpdate ) {
					control.editor.codemirror.setValue( value );
				}
			});

			// Prevent collapsing section when hitting Esc to tab out of editor.
			control.editor.codemirror.on( 'keydown', function onKeydown( codemirror, event ) {
				var escKeyCode = 27;
				if ( escKeyCode === event.keyCode ) {
					event.stopPropagation();
				}
			});

			control.deferred.codemirror.resolveWith( control, [ control.editor.codemirror ] );
		},

		/**
		 * Handle tabbing to the field after the editor.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		onTabNext: function onTabNext() {
			var control = this, controls, controlIndex, section;
			section = api.section( control.section() );
			controls = section.controls();
			controlIndex = controls.indexOf( control );
			if ( controls.length === controlIndex + 1 ) {
				$( '#customize-footer-actions .collapse-sidebar' ).trigger( 'focus' );
			} else {
				controls[ controlIndex + 1 ].container.find( ':focusable:first' ).focus();
			}
		},

		/**
		 * Handle tabbing to the field before the editor.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		onTabPrevious: function onTabPrevious() {
			var control = this, controls, controlIndex, section;
			section = api.section( control.section() );
			controls = section.controls();
			controlIndex = controls.indexOf( control );
			if ( 0 === controlIndex ) {
				section.contentContainer.find( '.customize-section-title .customize-help-toggle, .customize-section-title .customize-section-description.open .section-description-close' ).last().focus();
			} else {
				controls[ controlIndex - 1 ].contentContainer.find( ':focusable:first' ).focus();
			}
		},

		/**
		 * Update error notice.
		 *
		 * @since 4.9.0
		 * @param {Array} errorAnnotations - Error annotations.
		 * @return {void}
		 */
		onUpdateErrorNotice: function onUpdateErrorNotice( errorAnnotations ) {
			var control = this, message;
			control.setting.notifications.remove( 'csslint_error' );

			if ( 0 !== errorAnnotations.length ) {
				if ( 1 === errorAnnotations.length ) {
					message = api.l10n.customCssError.singular.replace( '%d', '1' );
				} else {
					message = api.l10n.customCssError.plural.replace( '%d', String( errorAnnotations.length ) );
				}
				control.setting.notifications.add( new api.Notification( 'csslint_error', {
					message: message,
					type: 'error'
				} ) );
			}
		},

		/**
		 * Initialize plain-textarea editor when syntax highlighting is disabled.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		initPlainTextareaEditor: function() {
			var control = this, $textarea = control.container.find( 'textarea' ), textarea = $textarea[0];

			$textarea.on( 'blur', function onBlur() {
				$textarea.data( 'next-tab-blurs', false );
			} );

			$textarea.on( 'keydown', function onKeydown( event ) {
				var selectionStart, selectionEnd, value, tabKeyCode = 9, escKeyCode = 27;

				if ( escKeyCode === event.keyCode ) {
					if ( ! $textarea.data( 'next-tab-blurs' ) ) {
						$textarea.data( 'next-tab-blurs', true );
						event.stopPropagation(); // Prevent collapsing the section.
					}
					return;
				}

				// Short-circuit if tab key is not being pressed or if a modifier key *is* being pressed.
				if ( tabKeyCode !== event.keyCode || event.ctrlKey || event.altKey || event.shiftKey ) {
					return;
				}

				// Prevent capturing Tab characters if Esc was pressed.
				if ( $textarea.data( 'next-tab-blurs' ) ) {
					return;
				}

				selectionStart = textarea.selectionStart;
				selectionEnd = textarea.selectionEnd;
				value = textarea.value;

				if ( selectionStart >= 0 ) {
					textarea.value = value.substring( 0, selectionStart ).concat( '\t', value.substring( selectionEnd ) );
					$textarea.selectionStart = textarea.selectionEnd = selectionStart + 1;
				}

				event.stopPropagation();
				event.preventDefault();
			});

			control.deferred.codemirror.rejectWith( control );
		}
	});

	/**
	 * Class wp.customize.DateTimeControl.
	 *
	 * @since 4.9.0
	 * @class    wp.customize.DateTimeControl
	 * @augments wp.customize.Control
	 */
	api.DateTimeControl = api.Control.extend(/** @lends wp.customize.DateTimeControl.prototype */{

		/**
		 * Initialize behaviors.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		ready: function ready() {
			var control = this;

			control.inputElements = {};
			control.invalidDate = false;

			_.bindAll( control, 'populateSetting', 'updateDaysForMonth', 'populateDateInputs' );

			if ( ! control.setting ) {
				throw new Error( 'Missing setting' );
			}

			control.container.find( '.date-input' ).each( function() {
				var input = $( this ), component, element;
				component = input.data( 'component' );
				element = new api.Element( input );
				control.inputElements[ component ] = element;
				control.elements.push( element );

				// Add invalid date error once user changes (and has blurred the input).
				input.on( 'change', function() {
					if ( control.invalidDate ) {
						control.notifications.add( new api.Notification( 'invalid_date', {
							message: api.l10n.invalidDate
						} ) );
					}
				} );

				// Remove the error immediately after validity change.
				input.on( 'input', _.debounce( function() {
					if ( ! control.invalidDate ) {
						control.notifications.remove( 'invalid_date' );
					}
				} ) );

				// Add zero-padding when blurring field.
				input.on( 'blur', _.debounce( function() {
					if ( ! control.invalidDate ) {
						control.populateDateInputs();
					}
				} ) );
			} );

			control.inputElements.month.bind( control.updateDaysForMonth );
			control.inputElements.year.bind( control.updateDaysForMonth );
			control.populateDateInputs();
			control.setting.bind( control.populateDateInputs );

			// Start populating setting after inputs have been populated.
			_.each( control.inputElements, function( element ) {
				element.bind( control.populateSetting );
			} );
		},

		/**
		 * Parse datetime string.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} datetime - Date/Time string. Accepts Y-m-d[ H:i[:s]] format.
		 * @return {Object|null} Returns object containing date components or null if parse error.
		 */
		parseDateTime: function parseDateTime( datetime ) {
			var control = this, matches, date, midDayHour = 12;

			if ( datetime ) {
				matches = datetime.match( /^(\d\d\d\d)-(\d\d)-(\d\d)(?: (\d\d):(\d\d)(?::(\d\d))?)?$/ );
			}

			if ( ! matches ) {
				return null;
			}

			matches.shift();

			date = {
				year: matches.shift(),
				month: matches.shift(),
				day: matches.shift(),
				hour: matches.shift() || '00',
				minute: matches.shift() || '00',
				second: matches.shift() || '00'
			};

			if ( control.params.includeTime && control.params.twelveHourFormat ) {
				date.hour = parseInt( date.hour, 10 );
				date.meridian = date.hour >= midDayHour ? 'pm' : 'am';
				date.hour = date.hour % midDayHour ? String( date.hour % midDayHour ) : String( midDayHour );
				delete date.second; // @todo Why only if twelveHourFormat?
			}

			return date;
		},

		/**
		 * Validates if input components have valid date and time.
		 *
		 * @since 4.9.0
		 * @return {boolean} If date input fields has error.
		 */
		validateInputs: function validateInputs() {
			var control = this, components, validityInput;

			control.invalidDate = false;

			components = [ 'year', 'day' ];
			if ( control.params.includeTime ) {
				components.push( 'hour', 'minute' );
			}

			_.find( components, function( component ) {
				var element, max, min, value;

				element = control.inputElements[ component ];
				validityInput = element.element.get( 0 );
				max = parseInt( element.element.attr( 'max' ), 10 );
				min = parseInt( element.element.attr( 'min' ), 10 );
				value = parseInt( element(), 10 );
				control.invalidDate = isNaN( value ) || value > max || value < min;

				if ( ! control.invalidDate ) {
					validityInput.setCustomValidity( '' );
				}

				return control.invalidDate;
			} );

			if ( control.inputElements.meridian && ! control.invalidDate ) {
				validityInput = control.inputElements.meridian.element.get( 0 );
				if ( 'am' !== control.inputElements.meridian.get() && 'pm' !== control.inputElements.meridian.get() ) {
					control.invalidDate = true;
				} else {
					validityInput.setCustomValidity( '' );
				}
			}

			if ( control.invalidDate ) {
				validityInput.setCustomValidity( api.l10n.invalidValue );
			} else {
				validityInput.setCustomValidity( '' );
			}
			if ( ! control.section() || api.section.has( control.section() ) && api.section( control.section() ).expanded() ) {
				_.result( validityInput, 'reportValidity' );
			}

			return control.invalidDate;
		},

		/**
		 * Updates number of days according to the month and year selected.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		updateDaysForMonth: function updateDaysForMonth() {
			var control = this, daysInMonth, year, month, day;

			month = parseInt( control.inputElements.month(), 10 );
			year = parseInt( control.inputElements.year(), 10 );
			day = parseInt( control.inputElements.day(), 10 );

			if ( month && year ) {
				daysInMonth = new Date( year, month, 0 ).getDate();
				control.inputElements.day.element.attr( 'max', daysInMonth );

				if ( day > daysInMonth ) {
					control.inputElements.day( String( daysInMonth ) );
				}
			}
		},

		/**
		 * Populate setting value from the inputs.
		 *
		 * @since 4.9.0
		 * @return {boolean} If setting updated.
		 */
		populateSetting: function populateSetting() {
			var control = this, date;

			if ( control.validateInputs() || ! control.params.allowPastDate && ! control.isFutureDate() ) {
				return false;
			}

			date = control.convertInputDateToString();
			control.setting.set( date );
			return true;
		},

		/**
		 * Converts input values to string in Y-m-d H:i:s format.
		 *
		 * @since 4.9.0
		 * @return {string} Date string.
		 */
		convertInputDateToString: function convertInputDateToString() {
			var control = this, date = '', dateFormat, hourInTwentyFourHourFormat,
				getElementValue, pad;

			pad = function( number, padding ) {
				var zeros;
				if ( String( number ).length < padding ) {
					zeros = padding - String( number ).length;
					number = Math.pow( 10, zeros ).toString().substr( 1 ) + String( number );
				}
				return number;
			};

			getElementValue = function( component ) {
				var value = parseInt( control.inputElements[ component ].get(), 10 );

				if ( _.contains( [ 'month', 'day', 'hour', 'minute' ], component ) ) {
					value = pad( value, 2 );
				} else if ( 'year' === component ) {
					value = pad( value, 4 );
				}
				return value;
			};

			dateFormat = [ 'year', '-', 'month', '-', 'day' ];
			if ( control.params.includeTime ) {
				hourInTwentyFourHourFormat = control.inputElements.meridian ? control.convertHourToTwentyFourHourFormat( control.inputElements.hour(), control.inputElements.meridian() ) : control.inputElements.hour();
				dateFormat = dateFormat.concat( [ ' ', pad( hourInTwentyFourHourFormat, 2 ), ':', 'minute', ':', '00' ] );
			}

			_.each( dateFormat, function( component ) {
				date += control.inputElements[ component ] ? getElementValue( component ) : component;
			} );

			return date;
		},

		/**
		 * Check if the date is in the future.
		 *
		 * @since 4.9.0
		 * @return {boolean} True if future date.
		 */
		isFutureDate: function isFutureDate() {
			var control = this;
			return 0 < api.utils.getRemainingTime( control.convertInputDateToString() );
		},

		/**
		 * Convert hour in twelve hour format to twenty four hour format.
		 *
		 * @since 4.9.0
		 * @param {string} hourInTwelveHourFormat - Hour in twelve hour format.
		 * @param {string} meridian - Either 'am' or 'pm'.
		 * @return {string} Hour in twenty four hour format.
		 */
		convertHourToTwentyFourHourFormat: function convertHour( hourInTwelveHourFormat, meridian ) {
			var hourInTwentyFourHourFormat, hour, midDayHour = 12;

			hour = parseInt( hourInTwelveHourFormat, 10 );
			if ( isNaN( hour ) ) {
				return '';
			}

			if ( 'pm' === meridian && hour < midDayHour ) {
				hourInTwentyFourHourFormat = hour + midDayHour;
			} else if ( 'am' === meridian && midDayHour === hour ) {
				hourInTwentyFourHourFormat = hour - midDayHour;
			} else {
				hourInTwentyFourHourFormat = hour;
			}

			return String( hourInTwentyFourHourFormat );
		},

		/**
		 * Populates date inputs in date fields.
		 *
		 * @since 4.9.0
		 * @return {boolean} Whether the inputs were populated.
		 */
		populateDateInputs: function populateDateInputs() {
			var control = this, parsed;

			parsed = control.parseDateTime( control.setting.get() );

			if ( ! parsed ) {
				return false;
			}

			_.each( control.inputElements, function( element, component ) {
				var value = parsed[ component ]; // This will be zero-padded string.

				// Set month and meridian regardless of focused state since they are dropdowns.
				if ( 'month' === component || 'meridian' === component ) {

					// Options in dropdowns are not zero-padded.
					value = value.replace( /^0/, '' );

					element.set( value );
				} else {

					value = parseInt( value, 10 );
					if ( ! element.element.is( document.activeElement ) ) {

						// Populate element with zero-padded value if not focused.
						element.set( parsed[ component ] );
					} else if ( value !== parseInt( element(), 10 ) ) {

						// Forcibly update the value if its underlying value changed, regardless of zero-padding.
						element.set( String( value ) );
					}
				}
			} );

			return true;
		},

		/**
		 * Toggle future date notification for date control.
		 *
		 * @since 4.9.0
		 * @param {boolean} notify Add or remove the notification.
		 * @return {wp.customize.DateTimeControl}
		 */
		toggleFutureDateNotification: function toggleFutureDateNotification( notify ) {
			var control = this, notificationCode, notification;

			notificationCode = 'not_future_date';

			if ( notify ) {
				notification = new api.Notification( notificationCode, {
					type: 'error',
					message: api.l10n.futureDateError
				} );
				control.notifications.add( notification );
			} else {
				control.notifications.remove( notificationCode );
			}

			return control;
		}
	});

	/**
	 * Class PreviewLinkControl.
	 *
	 * @since 4.9.0
	 * @class    wp.customize.PreviewLinkControl
	 * @augments wp.customize.Control
	 */
	api.PreviewLinkControl = api.Control.extend(/** @lends wp.customize.PreviewLinkControl.prototype */{

		defaults: _.extend( {}, api.Control.prototype.defaults, {
			templateId: 'customize-preview-link-control'
		} ),

		/**
		 * Initialize behaviors.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		ready: function ready() {
			var control = this, element, component, node, url, input, button;

			_.bindAll( control, 'updatePreviewLink' );

			if ( ! control.setting ) {
			    control.setting = new api.Value();
			}

			control.previewElements = {};

			control.container.find( '.preview-control-element' ).each( function() {
				node = $( this );
				component = node.data( 'component' );
				element = new api.Element( node );
				control.previewElements[ component ] = element;
				control.elements.push( element );
			} );

			url = control.previewElements.url;
			input = control.previewElements.input;
			button = control.previewElements.button;

			input.link( control.setting );
			url.link( control.setting );

			url.bind( function( value ) {
				url.element.parent().attr( {
					href: value,
					target: api.settings.changeset.uuid
				} );
			} );

			api.bind( 'ready', control.updatePreviewLink );
			api.state( 'saved' ).bind( control.updatePreviewLink );
			api.state( 'changesetStatus' ).bind( control.updatePreviewLink );
			api.state( 'activated' ).bind( control.updatePreviewLink );
			api.previewer.previewUrl.bind( control.updatePreviewLink );

			button.element.on( 'click', function( event ) {
				event.preventDefault();
				if ( control.setting() ) {
					input.element.select();
					document.execCommand( 'copy' );
					button( button.element.data( 'copied-text' ) );
				}
			} );

			url.element.parent().on( 'click', function( event ) {
				if ( $( this ).hasClass( 'disabled' ) ) {
					event.preventDefault();
				}
			} );

			button.element.on( 'mouseenter', function() {
				if ( control.setting() ) {
					button( button.element.data( 'copy-text' ) );
				}
			} );
		},

		/**
		 * Updates Preview Link
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		updatePreviewLink: function updatePreviewLink() {
			var control = this, unsavedDirtyValues;

			unsavedDirtyValues = ! api.state( 'saved' ).get() || '' === api.state( 'changesetStatus' ).get() || 'auto-draft' === api.state( 'changesetStatus' ).get();

			control.toggleSaveNotification( unsavedDirtyValues );
			control.previewElements.url.element.parent().toggleClass( 'disabled', unsavedDirtyValues );
			control.previewElements.button.element.prop( 'disabled', unsavedDirtyValues );
			control.setting.set( api.previewer.getFrontendPreviewUrl() );
		},

		/**
		 * Toggles save notification.
		 *
		 * @since 4.9.0
		 * @param {boolean} notify Add or remove notification.
		 * @return {void}
		 */
		toggleSaveNotification: function toggleSaveNotification( notify ) {
			var control = this, notificationCode, notification;

			notificationCode = 'changes_not_saved';

			if ( notify ) {
				notification = new api.Notification( notificationCode, {
					type: 'info',
					message: api.l10n.saveBeforeShare
				} );
				control.notifications.add( notification );
			} else {
				control.notifications.remove( notificationCode );
			}
		}
	});

	/**
	 * Change objects contained within the main customize object to Settings.
	 *
	 * @alias wp.customize.defaultConstructor
	 */
	api.defaultConstructor = api.Setting;

	/**
	 * Callback for resolved controls.
	 *
	 * @callback wp.customize.deferredControlsCallback
	 * @param {wp.customize.Control[]} controls Resolved controls.
	 */

	/**
	 * Collection of all registered controls.
	 *
	 * @alias wp.customize.control
	 *
	 * @since 3.4.0
	 *
	 * @type {Function}
	 * @param {...string} ids - One or more ids for controls to obtain.
	 * @param {deferredControlsCallback} [callback] - Function called when all supplied controls exist.
	 * @return {wp.customize.Control|undefined|jQuery.promise} Control instance or undefined (if function called with one id param),
	 *                                                         or promise resolving to requested controls.
	 *
	 * @example <caption>Loop over all registered controls.</caption>
	 * wp.customize.control.each( function( control ) { ... } );
	 *
	 * @example <caption>Getting `background_color` control instance.</caption>
	 * control = wp.customize.control( 'background_color' );
	 *
	 * @example <caption>Check if control exists.</caption>
	 * hasControl = wp.customize.control.has( 'background_color' );
	 *
	 * @example <caption>Deferred getting of `background_color` control until it exists, using callback.</caption>
	 * wp.customize.control( 'background_color', function( control ) { ... } );
	 *
	 * @example <caption>Get title and tagline controls when they both exist, using promise (only available when multiple IDs are present).</caption>
	 * promise = wp.customize.control( 'blogname', 'blogdescription' );
	 * promise.done( function( titleControl, taglineControl ) { ... } );
	 *
	 * @example <caption>Get title and tagline controls when they both exist, using callback.</caption>
	 * wp.customize.control( 'blogname', 'blogdescription', function( titleControl, taglineControl ) { ... } );
	 *
	 * @example <caption>Getting setting value for `background_color` control.</caption>
	 * value = wp.customize.control( 'background_color ').setting.get();
	 * value = wp.customize( 'background_color' ).get(); // Same as above, since setting ID and control ID are the same.
	 *
	 * @example <caption>Add new control for site title.</caption>
	 * wp.customize.control.add( new wp.customize.Control( 'other_blogname', {
	 *     setting: 'blogname',
	 *     type: 'text',
	 *     label: 'Site title',
	 *     section: 'other_site_identify'
	 * } ) );
	 *
	 * @example <caption>Remove control.</caption>
	 * wp.customize.control.remove( 'other_blogname' );
	 *
	 * @example <caption>Listen for control being added.</caption>
	 * wp.customize.control.bind( 'add', function( addedControl ) { ... } )
	 *
	 * @example <caption>Listen for control being removed.</caption>
	 * wp.customize.control.bind( 'removed', function( removedControl ) { ... } )
	 */
	api.control = new api.Values({ defaultConstructor: api.Control });

	/**
	 * Callback for resolved sections.
	 *
	 * @callback wp.customize.deferredSectionsCallback
	 * @param {wp.customize.Section[]} sections Resolved sections.
	 */

	/**
	 * Collection of all registered sections.
	 *
	 * @alias wp.customize.section
	 *
	 * @since 3.4.0
	 *
	 * @type {Function}
	 * @param {...string} ids - One or more ids for sections to obtain.
	 * @param {deferredSectionsCallback} [callback] - Function called when all supplied sections exist.
	 * @return {wp.customize.Section|undefined|jQuery.promise} Section instance or undefined (if function called with one id param),
	 *                                                         or promise resolving to requested sections.
	 *
	 * @example <caption>Loop over all registered sections.</caption>
	 * wp.customize.section.each( function( section ) { ... } )
	 *
	 * @example <caption>Getting `title_tagline` section instance.</caption>
	 * section = wp.customize.section( 'title_tagline' )
	 *
	 * @example <caption>Expand dynamically-created section when it exists.</caption>
	 * wp.customize.section( 'dynamically_created', function( section ) {
	 *     section.expand();
	 * } );
	 *
	 * @see {@link wp.customize.control} for further examples of how to interact with {@link wp.customize.Values} instances.
	 */
	api.section = new api.Values({ defaultConstructor: api.Section });

	/**
	 * Callback for resolved panels.
	 *
	 * @callback wp.customize.deferredPanelsCallback
	 * @param {wp.customize.Panel[]} panels Resolved panels.
	 */

	/**
	 * Collection of all registered panels.
	 *
	 * @alias wp.customize.panel
	 *
	 * @since 4.0.0
	 *
	 * @type {Function}
	 * @param {...string} ids - One or more ids for panels to obtain.
	 * @param {deferredPanelsCallback} [callback] - Function called when all supplied panels exist.
	 * @return {wp.customize.Panel|undefined|jQuery.promise} Panel instance or undefined (if function called with one id param),
	 *                                                       or promise resolving to requested panels.
	 *
	 * @example <caption>Loop over all registered panels.</caption>
	 * wp.customize.panel.each( function( panel ) { ... } )
	 *
	 * @example <caption>Getting nav_menus panel instance.</caption>
	 * panel = wp.customize.panel( 'nav_menus' );
	 *
	 * @example <caption>Expand dynamically-created panel when it exists.</caption>
	 * wp.customize.panel( 'dynamically_created', function( panel ) {
	 *     panel.expand();
	 * } );
	 *
	 * @see {@link wp.customize.control} for further examples of how to interact with {@link wp.customize.Values} instances.
	 */
	api.panel = new api.Values({ defaultConstructor: api.Panel });

	/**
	 * Callback for resolved notifications.
	 *
	 * @callback wp.customize.deferredNotificationsCallback
	 * @param {wp.customize.Notification[]} notifications Resolved notifications.
	 */

	/**
	 * Collection of all global notifications.
	 *
	 * @alias wp.customize.notifications
	 *
	 * @since 4.9.0
	 *
	 * @type {Function}
	 * @param {...string} codes - One or more codes for notifications to obtain.
	 * @param {deferredNotificationsCallback} [callback] - Function called when all supplied notifications exist.
	 * @return {wp.customize.Notification|undefined|jQuery.promise} Notification instance or undefined (if function called with one code param),
	 *                                                              or promise resolving to requested notifications.
	 *
	 * @example <caption>Check if existing notification</caption>
	 * exists = wp.customize.notifications.has( 'a_new_day_arrived' );
	 *
	 * @example <caption>Obtain existing notification</caption>
	 * notification = wp.customize.notifications( 'a_new_day_arrived' );
	 *
	 * @example <caption>Obtain notification that may not exist yet.</caption>
	 * wp.customize.notifications( 'a_new_day_arrived', function( notification ) { ... } );
	 *
	 * @example <caption>Add a warning notification.</caption>
	 * wp.customize.notifications.add( new wp.customize.Notification( 'midnight_almost_here', {
	 *     type: 'warning',
	 *     message: 'Midnight has almost arrived!',
	 *     dismissible: true
	 * } ) );
	 *
	 * @example <caption>Remove a notification.</caption>
	 * wp.customize.notifications.remove( 'a_new_day_arrived' );
	 *
	 * @see {@link wp.customize.control} for further examples of how to interact with {@link wp.customize.Values} instances.
	 */
	api.notifications = new api.Notifications();

	api.PreviewFrame = api.Messenger.extend(/** @lends wp.customize.PreviewFrame.prototype */{
		sensitivity: null, // Will get set to api.settings.timeouts.previewFrameSensitivity.

		/**
		 * An object that fetches a preview in the background of the document, which
		 * allows for seamless replacement of an existing preview.
		 *
		 * @constructs wp.customize.PreviewFrame
		 * @augments   wp.customize.Messenger
		 *
		 * @param {Object} params.container
		 * @param {Object} params.previewUrl
		 * @param {Object} params.query
		 * @param {Object} options
		 */
		initialize: function( params, options ) {
			var deferred = $.Deferred();

			/*
			 * Make the instance of the PreviewFrame the promise object
			 * so other objects can easily interact with it.
			 */
			deferred.promise( this );

			this.container = params.container;

			$.extend( params, { channel: api.PreviewFrame.uuid() });

			api.Messenger.prototype.initialize.call( this, params, options );

			this.add( 'previewUrl', params.previewUrl );

			this.query = $.extend( params.query || {}, { customize_messenger_channel: this.channel() });

			this.run( deferred );
		},

		/**
		 * Run the preview request.
		 *
		 * @param {Object} deferred jQuery Deferred object to be resolved with
		 *                          the request.
		 */
		run: function( deferred ) {
			var previewFrame = this,
				loaded = false,
				ready = false,
				readyData = null,
				hasPendingChangesetUpdate = '{}' !== previewFrame.query.customized,
				urlParser,
				params,
				form;

			if ( previewFrame._ready ) {
				previewFrame.unbind( 'ready', previewFrame._ready );
			}

			previewFrame._ready = function( data ) {
				ready = true;
				readyData = data;
				previewFrame.container.addClass( 'iframe-ready' );
				if ( ! data ) {
					return;
				}

				if ( loaded ) {
					deferred.resolveWith( previewFrame, [ data ] );
				}
			};

			previewFrame.bind( 'ready', previewFrame._ready );

			urlParser = document.createElement( 'a' );
			urlParser.href = previewFrame.previewUrl();

			params = _.extend(
				api.utils.parseQueryString( urlParser.search.substr( 1 ) ),
				{
					customize_changeset_uuid: previewFrame.query.customize_changeset_uuid,
					customize_theme: previewFrame.query.customize_theme,
					customize_messenger_channel: previewFrame.query.customize_messenger_channel
				}
			);
			if ( api.settings.changeset.autosaved || ! api.state( 'saved' ).get() ) {
				params.customize_autosaved = 'on';
			}

			urlParser.search = $.param( params );
			previewFrame.iframe = $( '<iframe />', {
				title: api.l10n.previewIframeTitle,
				name: 'customize-' + previewFrame.channel()
			} );
			previewFrame.iframe.attr( 'onmousewheel', '' ); // Workaround for Safari bug. See WP Trac #38149.
			previewFrame.iframe.attr( 'sandbox', 'allow-forms allow-modals allow-orientation-lock allow-pointer-lock allow-popups allow-popups-to-escape-sandbox allow-presentation allow-same-origin allow-scripts' );

			if ( ! hasPendingChangesetUpdate ) {
				previewFrame.iframe.attr( 'src', urlParser.href );
			} else {
				previewFrame.iframe.attr( 'data-src', urlParser.href ); // For debugging purposes.
			}

			previewFrame.iframe.appendTo( previewFrame.container );
			previewFrame.targetWindow( previewFrame.iframe[0].contentWindow );

			/*
			 * Submit customized data in POST request to preview frame window since
			 * there are setting value changes not yet written to changeset.
			 */
			if ( hasPendingChangesetUpdate ) {
				form = $( '<form>', {
					action: urlParser.href,
					target: previewFrame.iframe.attr( 'name' ),
					method: 'post',
					hidden: 'hidden'
				} );
				form.append( $( '<input>', {
					type: 'hidden',
					name: '_method',
					value: 'GET'
				} ) );
				_.each( previewFrame.query, function( value, key ) {
					form.append( $( '<input>', {
						type: 'hidden',
						name: key,
						value: value
					} ) );
				} );
				previewFrame.container.append( form );
				form.trigger( 'submit' );
				form.remove(); // No need to keep the form around after submitted.
			}

			previewFrame.bind( 'iframe-loading-error', function( error ) {
				previewFrame.iframe.remove();

				// Check if the user is not logged in.
				if ( 0 === error ) {
					previewFrame.login( deferred );
					return;
				}

				// Check for cheaters.
				if ( -1 === error ) {
					deferred.rejectWith( previewFrame, [ 'cheatin' ] );
					return;
				}

				deferred.rejectWith( previewFrame, [ 'request failure' ] );
			} );

			previewFrame.iframe.one( 'load', function() {
				loaded = true;

				if ( ready ) {
					deferred.resolveWith( previewFrame, [ readyData ] );
				} else {
					setTimeout( function() {
						deferred.rejectWith( previewFrame, [ 'ready timeout' ] );
					}, previewFrame.sensitivity );
				}
			});
		},

		login: function( deferred ) {
			var self = this,
				reject;

			reject = function() {
				deferred.rejectWith( self, [ 'logged out' ] );
			};

			if ( this.triedLogin ) {
				return reject();
			}

			// Check if we have an admin cookie.
			$.get( api.settings.url.ajax, {
				action: 'logged-in'
			}).fail( reject ).done( function( response ) {
				var iframe;

				if ( '1' !== response ) {
					reject();
				}

				iframe = $( '<iframe />', { 'src': self.previewUrl(), 'title': api.l10n.previewIframeTitle } ).hide();
				iframe.appendTo( self.container );
				iframe.on( 'load', function() {
					self.triedLogin = true;

					iframe.remove();
					self.run( deferred );
				});
			});
		},

		destroy: function() {
			api.Messenger.prototype.destroy.call( this );

			if ( this.iframe ) {
				this.iframe.remove();
			}

			delete this.iframe;
			delete this.targetWindow;
		}
	});

	(function(){
		var id = 0;
		/**
		 * Return an incremented ID for a preview messenger channel.
		 *
		 * This function is named "uuid" for historical reasons, but it is a
		 * misnomer as it is not an actual UUID, and it is not universally unique.
		 * This is not to be confused with `api.settings.changeset.uuid`.
		 *
		 * @return {string}
		 */
		api.PreviewFrame.uuid = function() {
			return 'preview-' + String( id++ );
		};
	}());

	/**
	 * Set the document title of the customizer.
	 *
	 * @alias wp.customize.setDocumentTitle
	 *
	 * @since 4.1.0
	 *
	 * @param {string} documentTitle
	 */
	api.setDocumentTitle = function ( documentTitle ) {
		var tmpl, title;
		tmpl = api.settings.documentTitleTmpl;
		title = tmpl.replace( '%s', documentTitle );
		document.title = title;
		api.trigger( 'title', title );
	};

	api.Previewer = api.Messenger.extend(/** @lends wp.customize.Previewer.prototype */{
		refreshBuffer: null, // Will get set to api.settings.timeouts.windowRefresh.

		/**
		 * @constructs wp.customize.Previewer
		 * @augments   wp.customize.Messenger
		 *
		 * @param {Array}  params.allowedUrls
		 * @param {string} params.container   A selector or jQuery element for the preview
		 *                                    frame to be placed.
		 * @param {string} params.form
		 * @param {string} params.previewUrl  The URL to preview.
		 * @param {Object} options
		 */
		initialize: function( params, options ) {
			var previewer = this,
				urlParser = document.createElement( 'a' );

			$.extend( previewer, options || {} );
			previewer.deferred = {
				active: $.Deferred()
			};

			// Debounce to prevent hammering server and then wait for any pending update requests.
			previewer.refresh = _.debounce(
				( function( originalRefresh ) {
					return function() {
						var isProcessingComplete, refreshOnceProcessingComplete;
						isProcessingComplete = function() {
							return 0 === api.state( 'processing' ).get();
						};
						if ( isProcessingComplete() ) {
							originalRefresh.call( previewer );
						} else {
							refreshOnceProcessingComplete = function() {
								if ( isProcessingComplete() ) {
									originalRefresh.call( previewer );
									api.state( 'processing' ).unbind( refreshOnceProcessingComplete );
								}
							};
							api.state( 'processing' ).bind( refreshOnceProcessingComplete );
						}
					};
				}( previewer.refresh ) ),
				previewer.refreshBuffer
			);

			previewer.container   = api.ensure( params.container );
			previewer.allowedUrls = params.allowedUrls;

			params.url = window.location.href;

			api.Messenger.prototype.initialize.call( previewer, params );

			urlParser.href = previewer.origin();
			previewer.add( 'scheme', urlParser.protocol.replace( /:$/, '' ) );

			/*
			 * Limit the URL to internal, front-end links.
			 *
			 * If the front end and the admin are served from the same domain, load the
			 * preview over ssl if the Customizer is being loaded over ssl. This avoids
			 * insecure content warnings. This is not attempted if the admin and front end
			 * are on different domains to avoid the case where the front end doesn't have
			 * ssl certs.
			 */

			previewer.add( 'previewUrl', params.previewUrl ).setter( function( to ) {
				var result = null, urlParser, queryParams, parsedAllowedUrl, parsedCandidateUrls = [];
				urlParser = document.createElement( 'a' );
				urlParser.href = to;

				// Abort if URL is for admin or (static) files in wp-includes or wp-content.
				if ( /\/wp-(admin|includes|content)(\/|$)/.test( urlParser.pathname ) ) {
					return null;
				}

				// Remove state query params.
				if ( urlParser.search.length > 1 ) {
					queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
					delete queryParams.customize_changeset_uuid;
					delete queryParams.customize_theme;
					delete queryParams.customize_messenger_channel;
					delete queryParams.customize_autosaved;
					if ( _.isEmpty( queryParams ) ) {
						urlParser.search = '';
					} else {
						urlParser.search = $.param( queryParams );
					}
				}

				parsedCandidateUrls.push( urlParser );

				// Prepend list with URL that matches the scheme/protocol of the iframe.
				if ( previewer.scheme.get() + ':' !== urlParser.protocol ) {
					urlParser = document.createElement( 'a' );
					urlParser.href = parsedCandidateUrls[0].href;
					urlParser.protocol = previewer.scheme.get() + ':';
					parsedCandidateUrls.unshift( urlParser );
				}

				// Attempt to match the URL to the control frame's scheme and check if it's allowed. If not, try the original URL.
				parsedAllowedUrl = document.createElement( 'a' );
				_.find( parsedCandidateUrls, function( parsedCandidateUrl ) {
					return ! _.isUndefined( _.find( previewer.allowedUrls, function( allowedUrl ) {
						parsedAllowedUrl.href = allowedUrl;
						if ( urlParser.protocol === parsedAllowedUrl.protocol && urlParser.host === parsedAllowedUrl.host && 0 === urlParser.pathname.indexOf( parsedAllowedUrl.pathname.replace( /\/$/, '' ) ) ) {
							result = parsedCandidateUrl.href;
							return true;
						}
					} ) );
				} );

				return result;
			});

			previewer.bind( 'ready', previewer.ready );

			// Start listening for keep-alive messages when iframe first loads.
			previewer.deferred.active.done( _.bind( previewer.keepPreviewAlive, previewer ) );

			previewer.bind( 'synced', function() {
				previewer.send( 'active' );
			} );

			// Refresh the preview when the URL is changed (but not yet).
			previewer.previewUrl.bind( previewer.refresh );

			previewer.scroll = 0;
			previewer.bind( 'scroll', function( distance ) {
				previewer.scroll = distance;
			});

			// Update the URL when the iframe sends a URL message, resetting scroll position. If URL is unchanged, then refresh.
			previewer.bind( 'url', function( url ) {
				var onUrlChange, urlChanged = false;
				previewer.scroll = 0;
				onUrlChange = function() {
					urlChanged = true;
				};
				previewer.previewUrl.bind( onUrlChange );
				previewer.previewUrl.set( url );
				previewer.previewUrl.unbind( onUrlChange );
				if ( ! urlChanged ) {
					previewer.refresh();
				}
			} );

			// Update the document title when the preview changes.
			previewer.bind( 'documentTitle', function ( title ) {
				api.setDocumentTitle( title );
			} );
		},

		/**
		 * Handle the preview receiving the ready message.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @param {Object} data - Data from preview.
		 * @param {string} data.currentUrl - Current URL.
		 * @param {Object} data.activePanels - Active panels.
		 * @param {Object} data.activeSections Active sections.
		 * @param {Object} data.activeControls Active controls.
		 * @return {void}
		 */
		ready: function( data ) {
			var previewer = this, synced = {}, constructs;

			synced.settings = api.get();
			synced['settings-modified-while-loading'] = previewer.settingsModifiedWhileLoading;
			if ( 'resolved' !== previewer.deferred.active.state() || previewer.loading ) {
				synced.scroll = previewer.scroll;
			}
			synced['edit-shortcut-visibility'] = api.state( 'editShortcutVisibility' ).get();
			previewer.send( 'sync', synced );

			// Set the previewUrl without causing the url to set the iframe.
			if ( data.currentUrl ) {
				previewer.previewUrl.unbind( previewer.refresh );
				previewer.previewUrl.set( data.currentUrl );
				previewer.previewUrl.bind( previewer.refresh );
			}

			/*
			 * Walk over all panels, sections, and controls and set their
			 * respective active states to true if the preview explicitly
			 * indicates as such.
			 */
			constructs = {
				panel: data.activePanels,
				section: data.activeSections,
				control: data.activeControls
			};
			_( constructs ).each( function ( activeConstructs, type ) {
				api[ type ].each( function ( construct, id ) {
					var isDynamicallyCreated = _.isUndefined( api.settings[ type + 's' ][ id ] );

					/*
					 * If the construct was created statically in PHP (not dynamically in JS)
					 * then consider a missing (undefined) value in the activeConstructs to
					 * mean it should be deactivated (since it is gone). But if it is
					 * dynamically created then only toggle activation if the value is defined,
					 * as this means that the construct was also then correspondingly
					 * created statically in PHP and the active callback is available.
					 * Otherwise, dynamically-created constructs should normally have
					 * their active states toggled in JS rather than from PHP.
					 */
					if ( ! isDynamicallyCreated || ! _.isUndefined( activeConstructs[ id ] ) ) {
						if ( activeConstructs[ id ] ) {
							construct.activate();
						} else {
							construct.deactivate();
						}
					}
				} );
			} );

			if ( data.settingValidities ) {
				api._handleSettingValidities( {
					settingValidities: data.settingValidities,
					focusInvalidControl: false
				} );
			}
		},

		/**
		 * Keep the preview alive by listening for ready and keep-alive messages.
		 *
		 * If a message is not received in the allotted time then the iframe will be set back to the last known valid URL.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @return {void}
		 */
		keepPreviewAlive: function keepPreviewAlive() {
			var previewer = this, keepAliveTick, timeoutId, handleMissingKeepAlive, scheduleKeepAliveCheck;

			/**
			 * Schedule a preview keep-alive check.
			 *
			 * Note that if a page load takes longer than keepAliveCheck milliseconds,
			 * the keep-alive messages will still be getting sent from the previous
			 * URL.
			 */
			scheduleKeepAliveCheck = function() {
				timeoutId = setTimeout( handleMissingKeepAlive, api.settings.timeouts.keepAliveCheck );
			};

			/**
			 * Set the previewerAlive state to true when receiving a message from the preview.
			 */
			keepAliveTick = function() {
				api.state( 'previewerAlive' ).set( true );
				clearTimeout( timeoutId );
				scheduleKeepAliveCheck();
			};

			/**
			 * Set the previewerAlive state to false if keepAliveCheck milliseconds have transpired without a message.
			 *
			 * This is most likely to happen in the case of a connectivity error, or if the theme causes the browser
			 * to navigate to a non-allowed URL. Setting this state to false will force settings with a postMessage
			 * transport to use refresh instead, causing the preview frame also to be replaced with the current
			 * allowed preview URL.
			 */
			handleMissingKeepAlive = function() {
				api.state( 'previewerAlive' ).set( false );
			};
			scheduleKeepAliveCheck();

			previewer.bind( 'ready', keepAliveTick );
			previewer.bind( 'keep-alive', keepAliveTick );
		},

		/**
		 * Query string data sent with each preview request.
		 *
		 * @abstract
		 */
		query: function() {},

		abort: function() {
			if ( this.loading ) {
				this.loading.destroy();
				delete this.loading;
			}
		},

		/**
		 * Refresh the preview seamlessly.
		 *
		 * @since 3.4.0
		 * @access public
		 *
		 * @return {void}
		 */
		refresh: function() {
			var previewer = this, onSettingChange;

			// Display loading indicator.
			previewer.send( 'loading-initiated' );

			previewer.abort();

			previewer.loading = new api.PreviewFrame({
				url:        previewer.url(),
				previewUrl: previewer.previewUrl(),
				query:      previewer.query( { excludeCustomizedSaved: true } ) || {},
				container:  previewer.container
			});

			previewer.settingsModifiedWhileLoading = {};
			onSettingChange = function( setting ) {
				previewer.settingsModifiedWhileLoading[ setting.id ] = true;
			};
			api.bind( 'change', onSettingChange );
			previewer.loading.always( function() {
				api.unbind( 'change', onSettingChange );
			} );

			previewer.loading.done( function( readyData ) {
				var loadingFrame = this, onceSynced;

				previewer.preview = loadingFrame;
				previewer.targetWindow( loadingFrame.targetWindow() );
				previewer.channel( loadingFrame.channel() );

				onceSynced = function() {
					loadingFrame.unbind( 'synced', onceSynced );
					if ( previewer._previousPreview ) {
						previewer._previousPreview.destroy();
					}
					previewer._previousPreview = previewer.preview;
					previewer.deferred.active.resolve();
					delete previewer.loading;
				};
				loadingFrame.bind( 'synced', onceSynced );

				// This event will be received directly by the previewer in normal navigation; this is only needed for seamless refresh.
				previewer.trigger( 'ready', readyData );
			});

			previewer.loading.fail( function( reason ) {
				previewer.send( 'loading-failed' );

				if ( 'logged out' === reason ) {
					if ( previewer.preview ) {
						previewer.preview.destroy();
						delete previewer.preview;
					}

					previewer.login().done( previewer.refresh );
				}

				if ( 'cheatin' === reason ) {
					previewer.cheatin();
				}
			});
		},

		login: function() {
			var previewer = this,
				deferred, messenger, iframe;

			if ( this._login ) {
				return this._login;
			}

			deferred = $.Deferred();
			this._login = deferred.promise();

			messenger = new api.Messenger({
				channel: 'login',
				url:     api.settings.url.login
			});

			iframe = $( '<iframe />', { 'src': api.settings.url.login, 'title': api.l10n.loginIframeTitle } ).appendTo( this.container );

			messenger.targetWindow( iframe[0].contentWindow );

			messenger.bind( 'login', function () {
				var refreshNonces = previewer.refreshNonces();

				refreshNonces.always( function() {
					iframe.remove();
					messenger.destroy();
					delete previewer._login;
				});

				refreshNonces.done( function() {
					deferred.resolve();
				});

				refreshNonces.fail( function() {
					previewer.cheatin();
					deferred.reject();
				});
			});

			return this._login;
		},

		cheatin: function() {
			$( document.body ).empty().addClass( 'cheatin' ).append(
				'<h1>' + api.l10n.notAllowedHeading + '</h1>' +
				'<p>' + api.l10n.notAllowed + '</p>'
			);
		},

		refreshNonces: function() {
			var request, deferred = $.Deferred();

			deferred.promise();

			request = wp.ajax.post( 'customize_refresh_nonces', {
				wp_customize: 'on',
				customize_theme: api.settings.theme.stylesheet
			});

			request.done( function( response ) {
				api.trigger( 'nonce-refresh', response );
				deferred.resolve();
			});

			request.fail( function() {
				deferred.reject();
			});

			return deferred;
		}
	});

	api.settingConstructor = {};
	api.controlConstructor = {
		color:               api.ColorControl,
		media:               api.MediaControl,
		upload:              api.UploadControl,
		image:               api.ImageControl,
		cropped_image:       api.CroppedImageControl,
		site_icon:           api.SiteIconControl,
		header:              api.HeaderControl,
		background:          api.BackgroundControl,
		background_position: api.BackgroundPositionControl,
		theme:               api.ThemeControl,
		date_time:           api.DateTimeControl,
		code_editor:         api.CodeEditorControl
	};
	api.panelConstructor = {
		themes: api.ThemesPanel
	};
	api.sectionConstructor = {
		themes: api.ThemesSection,
		outer: api.OuterSection
	};

	/**
	 * Handle setting_validities in an error response for the customize-save request.
	 *
	 * Add notifications to the settings and focus on the first control that has an invalid setting.
	 *
	 * @alias wp.customize._handleSettingValidities
	 *
	 * @since 4.6.0
	 * @private
	 *
	 * @param {Object}  args
	 * @param {Object}  args.settingValidities
	 * @param {boolean} [args.focusInvalidControl=false]
	 * @return {void}
	 */
	api._handleSettingValidities = function handleSettingValidities( args ) {
		var invalidSettingControls, invalidSettings = [], wasFocused = false;

		// Find the controls that correspond to each invalid setting.
		_.each( args.settingValidities, function( validity, settingId ) {
			var setting = api( settingId );
			if ( setting ) {

				// Add notifications for invalidities.
				if ( _.isObject( validity ) ) {
					_.each( validity, function( params, code ) {
						var notification, existingNotification, needsReplacement = false;
						notification = new api.Notification( code, _.extend( { fromServer: true }, params ) );

						// Remove existing notification if already exists for code but differs in parameters.
						existingNotification = setting.notifications( notification.code );
						if ( existingNotification ) {
							needsReplacement = notification.type !== existingNotification.type || notification.message !== existingNotification.message || ! _.isEqual( notification.data, existingNotification.data );
						}
						if ( needsReplacement ) {
							setting.notifications.remove( code );
						}

						if ( ! setting.notifications.has( notification.code ) ) {
							setting.notifications.add( notification );
						}
						invalidSettings.push( setting.id );
					} );
				}

				// Remove notification errors that are no longer valid.
				setting.notifications.each( function( notification ) {
					if ( notification.fromServer && 'error' === notification.type && ( true === validity || ! validity[ notification.code ] ) ) {
						setting.notifications.remove( notification.code );
					}
				} );
			}
		} );

		if ( args.focusInvalidControl ) {
			invalidSettingControls = api.findControlsForSettings( invalidSettings );

			// Focus on the first control that is inside of an expanded section (one that is visible).
			_( _.values( invalidSettingControls ) ).find( function( controls ) {
				return _( controls ).find( function( control ) {
					var isExpanded = control.section() && api.section.has( control.section() ) && api.section( control.section() ).expanded();
					if ( isExpanded && control.expanded ) {
						isExpanded = control.expanded();
					}
					if ( isExpanded ) {
						control.focus();
						wasFocused = true;
					}
					return wasFocused;
				} );
			} );

			// Focus on the first invalid control.
			if ( ! wasFocused && ! _.isEmpty( invalidSettingControls ) ) {
				_.values( invalidSettingControls )[0][0].focus();
			}
		}
	};

	/**
	 * Find all controls associated with the given settings.
	 *
	 * @alias wp.customize.findControlsForSettings
	 *
	 * @since 4.6.0
	 * @param {string[]} settingIds Setting IDs.
	 * @return {Object<string, wp.customize.Control>} Mapping setting ids to arrays of controls.
	 */
	api.findControlsForSettings = function findControlsForSettings( settingIds ) {
		var controls = {}, settingControls;
		_.each( _.unique( settingIds ), function( settingId ) {
			var setting = api( settingId );
			if ( setting ) {
				settingControls = setting.findControls();
				if ( settingControls && settingControls.length > 0 ) {
					controls[ settingId ] = settingControls;
				}
			}
		} );
		return controls;
	};

	/**
	 * Sort panels, sections, controls by priorities. Hide empty sections and panels.
	 *
	 * @alias wp.customize.reflowPaneContents
	 *
	 * @since 4.1.0
	 */
	api.reflowPaneContents = _.bind( function () {

		var appendContainer, activeElement, rootHeadContainers, rootNodes = [], wasReflowed = false;

		if ( document.activeElement ) {
			activeElement = $( document.activeElement );
		}

		// Sort the sections within each panel.
		api.panel.each( function ( panel ) {
			if ( 'themes' === panel.id ) {
				return; // Don't reflow theme sections, as doing so moves them after the themes container.
			}

			var sections = panel.sections(),
				sectionHeadContainers = _.pluck( sections, 'headContainer' );
			rootNodes.push( panel );
			appendContainer = ( panel.contentContainer.is( 'ul' ) ) ? panel.contentContainer : panel.contentContainer.find( 'ul:first' );
			if ( ! api.utils.areElementListsEqual( sectionHeadContainers, appendContainer.children( '[id]' ) ) ) {
				_( sections ).each( function ( section ) {
					appendContainer.append( section.headContainer );
				} );
				wasReflowed = true;
			}
		} );

		// Sort the controls within each section.
		api.section.each( function ( section ) {
			var controls = section.controls(),
				controlContainers = _.pluck( controls, 'container' );
			if ( ! section.panel() ) {
				rootNodes.push( section );
			}
			appendContainer = ( section.contentContainer.is( 'ul' ) ) ? section.contentContainer : section.contentContainer.find( 'ul:first' );
			if ( ! api.utils.areElementListsEqual( controlContainers, appendContainer.children( '[id]' ) ) ) {
				_( controls ).each( function ( control ) {
					appendContainer.append( control.container );
				} );
				wasReflowed = true;
			}
		} );

		// Sort the root panels and sections.
		rootNodes.sort( api.utils.prioritySort );
		rootHeadContainers = _.pluck( rootNodes, 'headContainer' );
		appendContainer = $( '#customize-theme-controls .customize-pane-parent' ); // @todo This should be defined elsewhere, and to be configurable.
		if ( ! api.utils.areElementListsEqual( rootHeadContainers, appendContainer.children() ) ) {
			_( rootNodes ).each( function ( rootNode ) {
				appendContainer.append( rootNode.headContainer );
			} );
			wasReflowed = true;
		}

		// Now re-trigger the active Value callbacks so that the panels and sections can decide whether they can be rendered.
		api.panel.each( function ( panel ) {
			var value = panel.active();
			panel.active.callbacks.fireWith( panel.active, [ value, value ] );
		} );
		api.section.each( function ( section ) {
			var value = section.active();
			section.active.callbacks.fireWith( section.active, [ value, value ] );
		} );

		// Restore focus if there was a reflow and there was an active (focused) element.
		if ( wasReflowed && activeElement ) {
			activeElement.trigger( 'focus' );
		}
		api.trigger( 'pane-contents-reflowed' );
	}, api );

	// Define state values.
	api.state = new api.Values();
	_.each( [
		'saved',
		'saving',
		'trashing',
		'activated',
		'processing',
		'paneVisible',
		'expandedPanel',
		'expandedSection',
		'changesetDate',
		'selectedChangesetDate',
		'changesetStatus',
		'selectedChangesetStatus',
		'remainingTimeToPublish',
		'previewerAlive',
		'editShortcutVisibility',
		'changesetLocked',
		'previewedDevice'
	], function( name ) {
		api.state.create( name );
	});

	$( function() {
		api.settings = window._wpCustomizeSettings;
		api.l10n = window._wpCustomizeControlsL10n;

		// Check if we can run the Customizer.
		if ( ! api.settings ) {
			return;
		}

		// Bail if any incompatibilities are found.
		if ( ! $.support.postMessage || ( ! $.support.cors && api.settings.isCrossDomain ) ) {
			return;
		}

		if ( null === api.PreviewFrame.prototype.sensitivity ) {
			api.PreviewFrame.prototype.sensitivity = api.settings.timeouts.previewFrameSensitivity;
		}
		if ( null === api.Previewer.prototype.refreshBuffer ) {
			api.Previewer.prototype.refreshBuffer = api.settings.timeouts.windowRefresh;
		}

		var parent,
			body = $( document.body ),
			overlay = body.children( '.wp-full-overlay' ),
			title = $( '#customize-info .panel-title.site-title' ),
			closeBtn = $( '.customize-controls-close' ),
			saveBtn = $( '#save' ),
			btnWrapper = $( '#customize-save-button-wrapper' ),
			publishSettingsBtn = $( '#publish-settings' ),
			footerActions = $( '#customize-footer-actions' );

		// Add publish settings section in JS instead of PHP since the Customizer depends on it to function.
		api.bind( 'ready', function() {
			api.section.add( new api.OuterSection( 'publish_settings', {
				title: api.l10n.publishSettings,
				priority: 0,
				active: api.settings.theme.active
			} ) );
		} );

		// Set up publish settings section and its controls.
		api.section( 'publish_settings', function( section ) {
			var updateButtonsState, trashControl, updateSectionActive, isSectionActive, statusControl, dateControl, toggleDateControl, publishWhenTime, pollInterval, updateTimeArrivedPoller, cancelScheduleButtonReminder, timeArrivedPollingInterval = 1000;

			trashControl = new api.Control( 'trash_changeset', {
				type: 'button',
				section: section.id,
				priority: 30,
				input_attrs: {
					'class': 'button-link button-link-delete',
					value: api.l10n.discardChanges
				}
			} );
			api.control.add( trashControl );
			trashControl.deferred.embedded.done( function() {
				trashControl.container.find( '.button-link' ).on( 'click', function() {
					if ( confirm( api.l10n.trashConfirm ) ) {
						wp.customize.previewer.trash();
					}
				} );
			} );

			api.control.add( new api.PreviewLinkControl( 'changeset_preview_link', {
				section: section.id,
				priority: 100
			} ) );

			/**
			 * Return whether the publish settings section should be active.
			 *
			 * @return {boolean} Is section active.
			 */
			isSectionActive = function() {
				if ( ! api.state( 'activated' ).get() ) {
					return false;
				}
				if ( api.state( 'trashing' ).get() || 'trash' === api.state( 'changesetStatus' ).get() ) {
					return false;
				}
				if ( '' === api.state( 'changesetStatus' ).get() && api.state( 'saved' ).get() ) {
					return false;
				}
				return true;
			};

			// Make sure publish settings are not available while the theme is not active and the customizer is in a published state.
			section.active.validate = isSectionActive;
			updateSectionActive = function() {
				section.active.set( isSectionActive() );
			};
			api.state( 'activated' ).bind( updateSectionActive );
			api.state( 'trashing' ).bind( updateSectionActive );
			api.state( 'saved' ).bind( updateSectionActive );
			api.state( 'changesetStatus' ).bind( updateSectionActive );
			updateSectionActive();

			// Bind visibility of the publish settings button to whether the section is active.
			updateButtonsState = function() {
				publishSettingsBtn.toggle( section.active.get() );
				saveBtn.toggleClass( 'has-next-sibling', section.active.get() );
			};
			updateButtonsState();
			section.active.bind( updateButtonsState );

			function highlightScheduleButton() {
				if ( ! cancelScheduleButtonReminder ) {
					cancelScheduleButtonReminder = api.utils.highlightButton( btnWrapper, {
						delay: 1000,

						/*
						 * Only abort the reminder when the save button is focused.
						 * If the user clicks the settings button to toggle the
						 * settings closed, we'll still remind them.
						 */
						focusTarget: saveBtn
					} );
				}
			}
			function cancelHighlightScheduleButton() {
				if ( cancelScheduleButtonReminder ) {
					cancelScheduleButtonReminder();
					cancelScheduleButtonReminder = null;
				}
			}
			api.state( 'selectedChangesetStatus' ).bind( cancelHighlightScheduleButton );

			section.contentContainer.find( '.customize-action' ).text( api.l10n.updating );
			section.contentContainer.find( '.customize-section-back' ).removeAttr( 'tabindex' );
			publishSettingsBtn.prop( 'disabled', false );

			publishSettingsBtn.on( 'click', function( event ) {
				event.preventDefault();
				section.expanded.set( ! section.expanded.get() );
			} );

			section.expanded.bind( function( isExpanded ) {
				var defaultChangesetStatus;
				publishSettingsBtn.attr( 'aria-expanded', String( isExpanded ) );
				publishSettingsBtn.toggleClass( 'active', isExpanded );

				if ( isExpanded ) {
					cancelHighlightScheduleButton();
					return;
				}

				defaultChangesetStatus = api.state( 'changesetStatus' ).get();
				if ( '' === defaultChangesetStatus || 'auto-draft' === defaultChangesetStatus ) {
					defaultChangesetStatus = 'publish';
				}

				if ( api.state( 'selectedChangesetStatus' ).get() !== defaultChangesetStatus ) {
					highlightScheduleButton();
				} else if ( 'future' === api.state( 'selectedChangesetStatus' ).get() && api.state( 'selectedChangesetDate' ).get() !== api.state( 'changesetDate' ).get() ) {
					highlightScheduleButton();
				}
			} );

			statusControl = new api.Control( 'changeset_status', {
				priority: 10,
				type: 'radio',
				section: 'publish_settings',
				setting: api.state( 'selectedChangesetStatus' ),
				templateId: 'customize-selected-changeset-status-control',
				label: api.l10n.action,
				choices: api.settings.changeset.statusChoices
			} );
			api.control.add( statusControl );

			dateControl = new api.DateTimeControl( 'changeset_scheduled_date', {
				priority: 20,
				section: 'publish_settings',
				setting: api.state( 'selectedChangesetDate' ),
				minYear: ( new Date() ).getFullYear(),
				allowPastDate: false,
				includeTime: true,
				twelveHourFormat: /a/i.test( api.settings.timeFormat ),
				description: api.l10n.scheduleDescription
			} );
			dateControl.notifications.alt = true;
			api.control.add( dateControl );

			publishWhenTime = function() {
				api.state( 'selectedChangesetStatus' ).set( 'publish' );
				api.previewer.save();
			};

			// Start countdown for when the dateTime arrives, or clear interval when it is .
			updateTimeArrivedPoller = function() {
				var shouldPoll = (
					'future' === api.state( 'changesetStatus' ).get() &&
					'future' === api.state( 'selectedChangesetStatus' ).get() &&
					api.state( 'changesetDate' ).get() &&
					api.state( 'selectedChangesetDate' ).get() === api.state( 'changesetDate' ).get() &&
					api.utils.getRemainingTime( api.state( 'changesetDate' ).get() ) >= 0
				);

				if ( shouldPoll && ! pollInterval ) {
					pollInterval = setInterval( function() {
						var remainingTime = api.utils.getRemainingTime( api.state( 'changesetDate' ).get() );
						api.state( 'remainingTimeToPublish' ).set( remainingTime );
						if ( remainingTime <= 0 ) {
							clearInterval( pollInterval );
							pollInterval = 0;
							publishWhenTime();
						}
					}, timeArrivedPollingInterval );
				} else if ( ! shouldPoll && pollInterval ) {
					clearInterval( pollInterval );
					pollInterval = 0;
				}
			};

			api.state( 'changesetDate' ).bind( updateTimeArrivedPoller );
			api.state( 'selectedChangesetDate' ).bind( updateTimeArrivedPoller );
			api.state( 'changesetStatus' ).bind( updateTimeArrivedPoller );
			api.state( 'selectedChangesetStatus' ).bind( updateTimeArrivedPoller );
			updateTimeArrivedPoller();

			// Ensure dateControl only appears when selected status is future.
			dateControl.active.validate = function() {
				return 'future' === api.state( 'selectedChangesetStatus' ).get();
			};
			toggleDateControl = function( value ) {
				dateControl.active.set( 'future' === value );
			};
			toggleDateControl( api.state( 'selectedChangesetStatus' ).get() );
			api.state( 'selectedChangesetStatus' ).bind( toggleDateControl );

			// Show notification on date control when status is future but it isn't a future date.
			api.state( 'saving' ).bind( function( isSaving ) {
				if ( isSaving && 'future' === api.state( 'selectedChangesetStatus' ).get() ) {
					dateControl.toggleFutureDateNotification( ! dateControl.isFutureDate() );
				}
			} );
		} );

		// Prevent the form from saving when enter is pressed on an input or select element.
		$('#customize-controls').on( 'keydown', function( e ) {
			var isEnter = ( 13 === e.which ),
				$el = $( e.target );

			if ( isEnter && ( $el.is( 'input:not([type=button])' ) || $el.is( 'select' ) ) ) {
				e.preventDefault();
			}
		});

		// Expand/Collapse the main customizer customize info.
		$( '.customize-info' ).find( '> .accordion-section-title .customize-help-toggle' ).on( 'click', function() {
			var section = $( this ).closest( '.accordion-section' ),
				content = section.find( '.customize-panel-description:first' );

			if ( section.hasClass( 'cannot-expand' ) ) {
				return;
			}

			if ( section.hasClass( 'open' ) ) {
				section.toggleClass( 'open' );
				content.slideUp( api.Panel.prototype.defaultExpandedArguments.duration, function() {
					content.trigger( 'toggled' );
				} );
				$( this ).attr( 'aria-expanded', false );
			} else {
				content.slideDown( api.Panel.prototype.defaultExpandedArguments.duration, function() {
					content.trigger( 'toggled' );
				} );
				section.toggleClass( 'open' );
				$( this ).attr( 'aria-expanded', true );
			}
		});

		/**
		 * Initialize Previewer
		 *
		 * @alias wp.customize.previewer
		 */
		api.previewer = new api.Previewer({
			container:   '#customize-preview',
			form:        '#customize-controls',
			previewUrl:  api.settings.url.preview,
			allowedUrls: api.settings.url.allowed
		},/** @lends wp.customize.previewer */{

			nonce: api.settings.nonce,

			/**
			 * Build the query to send along with the Preview request.
			 *
			 * @since 3.4.0
			 * @since 4.7.0 Added options param.
			 * @access public
			 *
			 * @param {Object}  [options] Options.
			 * @param {boolean} [options.excludeCustomizedSaved=false] Exclude saved settings in customized response (values pending writing to changeset).
			 * @return {Object} Query vars.
			 */
			query: function( options ) {
				var queryVars = {
					wp_customize: 'on',
					customize_theme: api.settings.theme.stylesheet,
					nonce: this.nonce.preview,
					customize_changeset_uuid: api.settings.changeset.uuid
				};
				if ( api.settings.changeset.autosaved || ! api.state( 'saved' ).get() ) {
					queryVars.customize_autosaved = 'on';
				}

				/*
				 * Exclude customized data if requested especially for calls to requestChangesetUpdate.
				 * Changeset updates are differential and so it is a performance waste to send all of
				 * the dirty settings with each update.
				 */
				queryVars.customized = JSON.stringify( api.dirtyValues( {
					unsaved: options && options.excludeCustomizedSaved
				} ) );

				return queryVars;
			},

			/**
			 * Save (and publish) the customizer changeset.
			 *
			 * Updates to the changeset are transactional. If any of the settings
			 * are invalid then none of them will be written into the changeset.
			 * A revision will be made for the changeset post if revisions support
			 * has been added to the post type.
			 *
			 * @since 3.4.0
			 * @since 4.7.0 Added args param and return value.
			 *
			 * @param {Object} [args] Args.
			 * @param {string} [args.status=publish] Status.
			 * @param {string} [args.date] Date, in local time in MySQL format.
			 * @param {string} [args.title] Title
			 * @return {jQuery.promise} Promise.
			 */
			save: function( args ) {
				var previewer = this,
					deferred = $.Deferred(),
					changesetStatus = api.state( 'selectedChangesetStatus' ).get(),
					selectedChangesetDate = api.state( 'selectedChangesetDate' ).get(),
					processing = api.state( 'processing' ),
					submitWhenDoneProcessing,
					submit,
					modifiedWhileSaving = {},
					invalidSettings = [],
					invalidControls = [],
					invalidSettingLessControls = [];

				if ( args && args.status ) {
					changesetStatus = args.status;
				}

				if ( api.state( 'saving' ).get() ) {
					deferred.reject( 'already_saving' );
					deferred.promise();
				}

				api.state( 'saving' ).set( true );

				function captureSettingModifiedDuringSave( setting ) {
					modifiedWhileSaving[ setting.id ] = true;
				}

				submit = function () {
					var request, query, settingInvalidities = {}, latestRevision = api._latestRevision, errorCode = 'client_side_error';

					api.bind( 'change', captureSettingModifiedDuringSave );
					api.notifications.remove( errorCode );

					/*
					 * Block saving if there are any settings that are marked as
					 * invalid from the client (not from the server). Focus on
					 * the control.
					 */
					api.each( function( setting ) {
						setting.notifications.each( function( notification ) {
							if ( 'error' === notification.type && ! notification.fromServer ) {
								invalidSettings.push( setting.id );
								if ( ! settingInvalidities[ setting.id ] ) {
									settingInvalidities[ setting.id ] = {};
								}
								settingInvalidities[ setting.id ][ notification.code ] = notification;
							}
						} );
					} );

					// Find all invalid setting less controls with notification type error.
					api.control.each( function( control ) {
						if ( ! control.setting || ! control.setting.id && control.active.get() ) {
							control.notifications.each( function( notification ) {
							    if ( 'error' === notification.type ) {
								    invalidSettingLessControls.push( [ control ] );
							    }
							} );
						}
					} );

					invalidControls = _.union( invalidSettingLessControls, _.values( api.findControlsForSettings( invalidSettings ) ) );
					if ( ! _.isEmpty( invalidControls ) ) {

						invalidControls[0][0].focus();
						api.unbind( 'change', captureSettingModifiedDuringSave );

						if ( invalidSettings.length ) {
							api.notifications.add( new api.Notification( errorCode, {
								message: ( 1 === invalidSettings.length ? api.l10n.saveBlockedError.singular : api.l10n.saveBlockedError.plural ).replace( /%s/g, String( invalidSettings.length ) ),
								type: 'error',
								dismissible: true,
								saveFailure: true
							} ) );
						}

						deferred.rejectWith( previewer, [
							{ setting_invalidities: settingInvalidities }
						] );
						api.state( 'saving' ).set( false );
						return deferred.promise();
					}

					/*
					 * Note that excludeCustomizedSaved is intentionally false so that the entire
					 * set of customized data will be included if bypassed changeset update.
					 */
					query = $.extend( previewer.query( { excludeCustomizedSaved: false } ), {
						nonce: previewer.nonce.save,
						customize_changeset_status: changesetStatus
					} );

					if ( args && args.date ) {
						query.customize_changeset_date = args.date;
					} else if ( 'future' === changesetStatus && selectedChangesetDate ) {
						query.customize_changeset_date = selectedChangesetDate;
					}

					if ( args && args.title ) {
						query.customize_changeset_title = args.title;
					}

					// Allow plugins to modify the params included with the save request.
					api.trigger( 'save-request-params', query );

					/*
					 * Note that the dirty customized values will have already been set in the
					 * changeset and so technically query.customized could be deleted. However,
					 * it is remaining here to make sure that any settings that got updated
					 * quietly which may have not triggered an update request will also get
					 * included in the values that get saved to the changeset. This will ensure
					 * that values that get injected via the saved event will be included in
					 * the changeset. This also ensures that setting values that were invalid
					 * will get re-validated, perhaps in the case of settings that are invalid
					 * due to dependencies on other settings.
					 */
					request = wp.ajax.post( 'customize_save', query );
					api.state( 'processing' ).set( api.state( 'processing' ).get() + 1 );

					api.trigger( 'save', request );

					request.always( function () {
						api.state( 'processing' ).set( api.state( 'processing' ).get() - 1 );
						api.state( 'saving' ).set( false );
						api.unbind( 'change', captureSettingModifiedDuringSave );
					} );

					// Remove notifications that were added due to save failures.
					api.notifications.each( function( notification ) {
						if ( notification.saveFailure ) {
							api.notifications.remove( notification.code );
						}
					});

					request.fail( function ( response ) {
						var notification, notificationArgs;
						notificationArgs = {
							type: 'error',
							dismissible: true,
							fromServer: true,
							saveFailure: true
						};

						if ( '0' === response ) {
							response = 'not_logged_in';
						} else if ( '-1' === response ) {
							// Back-compat in case any other check_ajax_referer() call is dying.
							response = 'invalid_nonce';
						}

						if ( 'invalid_nonce' === response ) {
							previewer.cheatin();
						} else if ( 'not_logged_in' === response ) {
							previewer.preview.iframe.hide();
							previewer.login().done( function() {
								previewer.save();
								previewer.preview.iframe.show();
							} );
						} else if ( response.code ) {
							if ( 'not_future_date' === response.code && api.section.has( 'publish_settings' ) && api.section( 'publish_settings' ).active.get() && api.control.has( 'changeset_scheduled_date' ) ) {
								api.control( 'changeset_scheduled_date' ).toggleFutureDateNotification( true ).focus();
							} else if ( 'changeset_locked' !== response.code ) {
								notification = new api.Notification( response.code, _.extend( notificationArgs, {
									message: response.message
								} ) );
							}
						} else {
							notification = new api.Notification( 'unknown_error', _.extend( notificationArgs, {
								message: api.l10n.unknownRequestFail
							} ) );
						}

						if ( notification ) {
							api.notifications.add( notification );
						}

						if ( response.setting_validities ) {
							api._handleSettingValidities( {
								settingValidities: response.setting_validities,
								focusInvalidControl: true
							} );
						}

						deferred.rejectWith( previewer, [ response ] );
						api.trigger( 'error', response );

						// Start a new changeset if the underlying changeset was published.
						if ( 'changeset_already_published' === response.code && response.next_changeset_uuid ) {
							api.settings.changeset.uuid = response.next_changeset_uuid;
							api.state( 'changesetStatus' ).set( '' );
							if ( api.settings.changeset.branching ) {
								parent.send( 'changeset-uuid', api.settings.changeset.uuid );
							}
							api.previewer.send( 'changeset-uuid', api.settings.changeset.uuid );
						}
					} );

					request.done( function( response ) {

						previewer.send( 'saved', response );

						api.state( 'changesetStatus' ).set( response.changeset_status );
						if ( response.changeset_date ) {
							api.state( 'changesetDate' ).set( response.changeset_date );
						}

						if ( 'publish' === response.changeset_status ) {

							// Mark all published as clean if they haven't been modified during the request.
							api.each( function( setting ) {
								/*
								 * Note that the setting revision will be undefined in the case of setting
								 * values that are marked as dirty when the customizer is loaded, such as
								 * when applying starter content. All other dirty settings will have an
								 * associated revision due to their modification triggering a change event.
								 */
								if ( setting._dirty && ( _.isUndefined( api._latestSettingRevisions[ setting.id ] ) || api._latestSettingRevisions[ setting.id ] <= latestRevision ) ) {
									setting._dirty = false;
								}
							} );

							api.state( 'changesetStatus' ).set( '' );
							api.settings.changeset.uuid = response.next_changeset_uuid;
							if ( api.settings.changeset.branching ) {
								parent.send( 'changeset-uuid', api.settings.changeset.uuid );
							}
						}

						// Prevent subsequent requestChangesetUpdate() calls from including the settings that have been saved.
						api._lastSavedRevision = Math.max( latestRevision, api._lastSavedRevision );

						if ( response.setting_validities ) {
							api._handleSettingValidities( {
								settingValidities: response.setting_validities,
								focusInvalidControl: true
							} );
						}

						deferred.resolveWith( previewer, [ response ] );
						api.trigger( 'saved', response );

						// Restore the global dirty state if any settings were modified during save.
						if ( ! _.isEmpty( modifiedWhileSaving ) ) {
							api.state( 'saved' ).set( false );
						}
					} );
				};

				if ( 0 === processing() ) {
					submit();
				} else {
					submitWhenDoneProcessing = function () {
						if ( 0 === processing() ) {
							api.state.unbind( 'change', submitWhenDoneProcessing );
							submit();
						}
					};
					api.state.bind( 'change', submitWhenDoneProcessing );
				}

				return deferred.promise();
			},

			/**
			 * Trash the current changes.
			 *
			 * Revert the Customizer to its previously-published state.
			 *
			 * @since 4.9.0
			 *
			 * @return {jQuery.promise} Promise.
			 */
			trash: function trash() {
				var request, success, fail;

				api.state( 'trashing' ).set( true );
				api.state( 'processing' ).set( api.state( 'processing' ).get() + 1 );

				request = wp.ajax.post( 'customize_trash', {
					customize_changeset_uuid: api.settings.changeset.uuid,
					nonce: api.settings.nonce.trash
				} );
				api.notifications.add( new api.OverlayNotification( 'changeset_trashing', {
					type: 'info',
					message: api.l10n.revertingChanges,
					loading: true
				} ) );

				success = function() {
					var urlParser = document.createElement( 'a' ), queryParams;

					api.state( 'changesetStatus' ).set( 'trash' );
					api.each( function( setting ) {
						setting._dirty = false;
					} );
					api.state( 'saved' ).set( true );

					// Go back to Customizer without changeset.
					urlParser.href = location.href;
					queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
					delete queryParams.changeset_uuid;
					queryParams['return'] = api.settings.url['return'];
					urlParser.search = $.param( queryParams );
					location.replace( urlParser.href );
				};

				fail = function( code, message ) {
					var notificationCode = code || 'unknown_error';
					api.state( 'processing' ).set( api.state( 'processing' ).get() - 1 );
					api.state( 'trashing' ).set( false );
					api.notifications.remove( 'changeset_trashing' );
					api.notifications.add( new api.Notification( notificationCode, {
						message: message || api.l10n.unknownError,
						dismissible: true,
						type: 'error'
					} ) );
				};

				request.done( function( response ) {
					success( response.message );
				} );

				request.fail( function( response ) {
					var code = response.code || 'trashing_failed';
					if ( response.success || 'non_existent_changeset' === code || 'changeset_already_trashed' === code ) {
						success( response.message );
					} else {
						fail( code, response.message );
					}
				} );
			},

			/**
			 * Builds the front preview URL with the current state of customizer.
			 *
			 * @since 4.9.0
			 *
			 * @return {string} Preview URL.
			 */
			getFrontendPreviewUrl: function() {
				var previewer = this, params, urlParser;
				urlParser = document.createElement( 'a' );
				urlParser.href = previewer.previewUrl.get();
				params = api.utils.parseQueryString( urlParser.search.substr( 1 ) );

				if ( api.state( 'changesetStatus' ).get() && 'publish' !== api.state( 'changesetStatus' ).get() ) {
					params.customize_changeset_uuid = api.settings.changeset.uuid;
				}
				if ( ! api.state( 'activated' ).get() ) {
					params.customize_theme = api.settings.theme.stylesheet;
				}

				urlParser.search = $.param( params );
				return urlParser.href;
			}
		});

		// Ensure preview nonce is included with every customized request, to allow post data to be read.
		$.ajaxPrefilter( function injectPreviewNonce( options ) {
			if ( ! /wp_customize=on/.test( options.data ) ) {
				return;
			}
			options.data += '&' + $.param({
				customize_preview_nonce: api.settings.nonce.preview
			});
		});

		// Refresh the nonces if the preview sends updated nonces over.
		api.previewer.bind( 'nonce', function( nonce ) {
			$.extend( this.nonce, nonce );
		});

		// Refresh the nonces if login sends updated nonces over.
		api.bind( 'nonce-refresh', function( nonce ) {
			$.extend( api.settings.nonce, nonce );
			$.extend( api.previewer.nonce, nonce );
			api.previewer.send( 'nonce-refresh', nonce );
		});

		// Create Settings.
		$.each( api.settings.settings, function( id, data ) {
			var Constructor = api.settingConstructor[ data.type ] || api.Setting;
			api.add( new Constructor( id, data.value, {
				transport: data.transport,
				previewer: api.previewer,
				dirty: !! data.dirty
			} ) );
		});

		// Create Panels.
		$.each( api.settings.panels, function ( id, data ) {
			var Constructor = api.panelConstructor[ data.type ] || api.Panel, options;
			// Inclusion of params alias is for back-compat for custom panels that expect to augment this property.
			options = _.extend( { params: data }, data );
			api.panel.add( new Constructor( id, options ) );
		});

		// Create Sections.
		$.each( api.settings.sections, function ( id, data ) {
			var Constructor = api.sectionConstructor[ data.type ] || api.Section, options;
			// Inclusion of params alias is for back-compat for custom sections that expect to augment this property.
			options = _.extend( { params: data }, data );
			api.section.add( new Constructor( id, options ) );
		});

		// Create Controls.
		$.each( api.settings.controls, function( id, data ) {
			var Constructor = api.controlConstructor[ data.type ] || api.Control, options;
			// Inclusion of params alias is for back-compat for custom controls that expect to augment this property.
			options = _.extend( { params: data }, data );
			api.control.add( new Constructor( id, options ) );
		});

		// Focus the autofocused element.
		_.each( [ 'panel', 'section', 'control' ], function( type ) {
			var id = api.settings.autofocus[ type ];
			if ( ! id ) {
				return;
			}

			/*
			 * Defer focus until:
			 * 1. The panel, section, or control exists (especially for dynamically-created ones).
			 * 2. The instance is embedded in the document (and so is focusable).
			 * 3. The preview has finished loading so that the active states have been set.
			 */
			api[ type ]( id, function( instance ) {
				instance.deferred.embedded.done( function() {
					api.previewer.deferred.active.done( function() {
						instance.focus();
					});
				});
			});
		});

		api.bind( 'ready', api.reflowPaneContents );
		$( [ api.panel, api.section, api.control ] ).each( function ( i, values ) {
			var debouncedReflowPaneContents = _.debounce( api.reflowPaneContents, api.settings.timeouts.reflowPaneContents );
			values.bind( 'add', debouncedReflowPaneContents );
			values.bind( 'change', debouncedReflowPaneContents );
			values.bind( 'remove', debouncedReflowPaneContents );
		} );

		// Set up global notifications area.
		api.bind( 'ready', function setUpGlobalNotificationsArea() {
			var sidebar, containerHeight, containerInitialTop;
			api.notifications.container = $( '#customize-notifications-area' );

			api.notifications.bind( 'change', _.debounce( function() {
				api.notifications.render();
			} ) );

			sidebar = $( '.wp-full-overlay-sidebar-content' );
			api.notifications.bind( 'rendered', function updateSidebarTop() {
				sidebar.css( 'top', '' );
				if ( 0 !== api.notifications.count() ) {
					containerHeight = api.notifications.container.outerHeight() + 1;
					containerInitialTop = parseInt( sidebar.css( 'top' ), 10 );
					sidebar.css( 'top', containerInitialTop + containerHeight + 'px' );
				}
				api.notifications.trigger( 'sidebarTopUpdated' );
			});

			api.notifications.render();
		});

		// Save and activated states.
		(function( state ) {
			var saved = state.instance( 'saved' ),
				saving = state.instance( 'saving' ),
				trashing = state.instance( 'trashing' ),
				activated = state.instance( 'activated' ),
				processing = state.instance( 'processing' ),
				paneVisible = state.instance( 'paneVisible' ),
				expandedPanel = state.instance( 'expandedPanel' ),
				expandedSection = state.instance( 'expandedSection' ),
				changesetStatus = state.instance( 'changesetStatus' ),
				selectedChangesetStatus = state.instance( 'selectedChangesetStatus' ),
				changesetDate = state.instance( 'changesetDate' ),
				selectedChangesetDate = state.instance( 'selectedChangesetDate' ),
				previewerAlive = state.instance( 'previewerAlive' ),
				editShortcutVisibility  = state.instance( 'editShortcutVisibility' ),
				changesetLocked = state.instance( 'changesetLocked' ),
				populateChangesetUuidParam, defaultSelectedChangesetStatus;

			state.bind( 'change', function() {
				var canSave;

				if ( ! activated() ) {
					saveBtn.val( api.l10n.activate );
					closeBtn.find( '.screen-reader-text' ).text( api.l10n.cancel );

				} else if ( '' === changesetStatus.get() && saved() ) {
					if ( api.settings.changeset.currentUserCanPublish ) {
						saveBtn.val( api.l10n.published );
					} else {
						saveBtn.val( api.l10n.saved );
					}
					closeBtn.find( '.screen-reader-text' ).text( api.l10n.close );

				} else {
					if ( 'draft' === selectedChangesetStatus() ) {
						if ( saved() && selectedChangesetStatus() === changesetStatus() ) {
							saveBtn.val( api.l10n.draftSaved );
						} else {
							saveBtn.val( api.l10n.saveDraft );
						}
					} else if ( 'future' === selectedChangesetStatus() ) {
						if ( saved() && selectedChangesetStatus() === changesetStatus() ) {
							if ( changesetDate.get() !== selectedChangesetDate.get() ) {
								saveBtn.val( api.l10n.schedule );
							} else {
								saveBtn.val( api.l10n.scheduled );
							}
						} else {
							saveBtn.val( api.l10n.schedule );
						}
					} else if ( api.settings.changeset.currentUserCanPublish ) {
						saveBtn.val( api.l10n.publish );
					}
					closeBtn.find( '.screen-reader-text' ).text( api.l10n.cancel );
				}

				/*
				 * Save (publish) button should be enabled if saving is not currently happening,
				 * and if the theme is not active or the changeset exists but is not published.
				 */
				canSave = ! saving() && ! trashing() && ! changesetLocked() && ( ! activated() || ! saved() || ( changesetStatus() !== selectedChangesetStatus() && '' !== changesetStatus() ) || ( 'future' === selectedChangesetStatus() && changesetDate.get() !== selectedChangesetDate.get() ) );

				saveBtn.prop( 'disabled', ! canSave );
			});

			selectedChangesetStatus.validate = function( status ) {
				if ( '' === status || 'auto-draft' === status ) {
					return null;
				}
				return status;
			};

			defaultSelectedChangesetStatus = api.settings.changeset.currentUserCanPublish ? 'publish' : 'draft';

			// Set default states.
			changesetStatus( api.settings.changeset.status );
			changesetLocked( Boolean( api.settings.changeset.lockUser ) );
			changesetDate( api.settings.changeset.publishDate );
			selectedChangesetDate( api.settings.changeset.publishDate );
			selectedChangesetStatus( '' === api.settings.changeset.status || 'auto-draft' === api.settings.changeset.status ? defaultSelectedChangesetStatus : api.settings.changeset.status );
			selectedChangesetStatus.link( changesetStatus ); // Ensure that direct updates to status on server via wp.customizer.previewer.save() will update selection.
			saved( true );
			if ( '' === changesetStatus() ) { // Handle case for loading starter content.
				api.each( function( setting ) {
					if ( setting._dirty ) {
						saved( false );
					}
				} );
			}
			saving( false );
			activated( api.settings.theme.active );
			processing( 0 );
			paneVisible( true );
			expandedPanel( false );
			expandedSection( false );
			previewerAlive( true );
			editShortcutVisibility( 'visible' );

			api.bind( 'change', function() {
				if ( state( 'saved' ).get() ) {
					state( 'saved' ).set( false );
				}
			});

			// Populate changeset UUID param when state becomes dirty.
			if ( api.settings.changeset.branching ) {
				saved.bind( function( isSaved ) {
					if ( ! isSaved ) {
						populateChangesetUuidParam( true );
					}
				});
			}

			saving.bind( function( isSaving ) {
				body.toggleClass( 'saving', isSaving );
			} );
			trashing.bind( function( isTrashing ) {
				body.toggleClass( 'trashing', isTrashing );
			} );

			api.bind( 'saved', function( response ) {
				state('saved').set( true );
				if ( 'publish' === response.changeset_status ) {
					state( 'activated' ).set( true );
				}
			});

			activated.bind( function( to ) {
				if ( to ) {
					api.trigger( 'activated' );
				}
			});

			/**
			 * Populate URL with UUID via `history.replaceState()`.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @param {boolean} isIncluded Is UUID included.
			 * @return {void}
			 */
			populateChangesetUuidParam = function( isIncluded ) {
				var urlParser, queryParams;

				// Abort on IE9 which doesn't support history management.
				if ( ! history.replaceState ) {
					return;
				}

				urlParser = document.createElement( 'a' );
				urlParser.href = location.href;
				queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
				if ( isIncluded ) {
					if ( queryParams.changeset_uuid === api.settings.changeset.uuid ) {
						return;
					}
					queryParams.changeset_uuid = api.settings.changeset.uuid;
				} else {
					if ( ! queryParams.changeset_uuid ) {
						return;
					}
					delete queryParams.changeset_uuid;
				}
				urlParser.search = $.param( queryParams );
				history.replaceState( {}, document.title, urlParser.href );
			};

			// Show changeset UUID in URL when in branching mode and there is a saved changeset.
			if ( api.settings.changeset.branching ) {
				changesetStatus.bind( function( newStatus ) {
					populateChangesetUuidParam( '' !== newStatus && 'publish' !== newStatus && 'trash' !== newStatus );
				} );
			}
		}( api.state ) );

		/**
		 * Handles lock notice and take over request.
		 *
		 * @since 4.9.0
		 */
		( function checkAndDisplayLockNotice() {

			var LockedNotification = api.OverlayNotification.extend(/** @lends wp.customize~LockedNotification.prototype */{

				/**
				 * Template ID.
				 *
				 * @type {string}
				 */
				templateId: 'customize-changeset-locked-notification',

				/**
				 * Lock user.
				 *
				 * @type {object}
				 */
				lockUser: null,

				/**
				 * A notification that is displayed in a full-screen overlay with information about the locked changeset.
				 *
				 * @constructs wp.customize~LockedNotification
				 * @augments   wp.customize.OverlayNotification
				 *
				 * @since 4.9.0
				 *
				 * @param {string} [code] - Code.
				 * @param {Object} [params] - Params.
				 */
				initialize: function( code, params ) {
					var notification = this, _code, _params;
					_code = code || 'changeset_locked';
					_params = _.extend(
						{
							message: '',
							type: 'warning',
							containerClasses: '',
							lockUser: {}
						},
						params
					);
					_params.containerClasses += ' notification-changeset-locked';
					api.OverlayNotification.prototype.initialize.call( notification, _code, _params );
				},

				/**
				 * Render notification.
				 *
				 * @since 4.9.0
				 *
				 * @return {jQuery} Notification container.
				 */
				render: function() {
					var notification = this, li, data, takeOverButton, request;
					data = _.extend(
						{
							allowOverride: false,
							returnUrl: api.settings.url['return'],
							previewUrl: api.previewer.previewUrl.get(),
							frontendPreviewUrl: api.previewer.getFrontendPreviewUrl()
						},
						this
					);

					li = api.OverlayNotification.prototype.render.call( data );

					// Try to autosave the changeset now.
					api.requestChangesetUpdate( {}, { autosave: true } ).fail( function( response ) {
						if ( ! response.autosaved ) {
							li.find( '.notice-error' ).prop( 'hidden', false ).text( response.message || api.l10n.unknownRequestFail );
						}
					} );

					takeOverButton = li.find( '.customize-notice-take-over-button' );
					takeOverButton.on( 'click', function( event ) {
						event.preventDefault();
						if ( request ) {
							return;
						}

						takeOverButton.addClass( 'disabled' );
						request = wp.ajax.post( 'customize_override_changeset_lock', {
							wp_customize: 'on',
							customize_theme: api.settings.theme.stylesheet,
							customize_changeset_uuid: api.settings.changeset.uuid,
							nonce: api.settings.nonce.override_lock
						} );

						request.done( function() {
							api.notifications.remove( notification.code ); // Remove self.
							api.state( 'changesetLocked' ).set( false );
						} );

						request.fail( function( response ) {
							var message = response.message || api.l10n.unknownRequestFail;
							li.find( '.notice-error' ).prop( 'hidden', false ).text( message );

							request.always( function() {
								takeOverButton.removeClass( 'disabled' );
							} );
						} );

						request.always( function() {
							request = null;
						} );
					} );

					return li;
				}
			});

			/**
			 * Start lock.
			 *
			 * @since 4.9.0
			 *
			 * @param {Object} [args] - Args.
			 * @param {Object} [args.lockUser] - Lock user data.
			 * @param {boolean} [args.allowOverride=false] - Whether override is allowed.
			 * @return {void}
			 */
			function startLock( args ) {
				if ( args && args.lockUser ) {
					api.settings.changeset.lockUser = args.lockUser;
				}
				api.state( 'changesetLocked' ).set( true );
				api.notifications.add( new LockedNotification( 'changeset_locked', {
					lockUser: api.settings.changeset.lockUser,
					allowOverride: Boolean( args && args.allowOverride )
				} ) );
			}

			// Show initial notification.
			if ( api.settings.changeset.lockUser ) {
				startLock( { allowOverride: true } );
			}

			// Check for lock when sending heartbeat requests.
			$( document ).on( 'heartbeat-send.update_lock_notice', function( event, data ) {
				data.check_changeset_lock = true;
				data.changeset_uuid = api.settings.changeset.uuid;
			} );

			// Handle heartbeat ticks.
			$( document ).on( 'heartbeat-tick.update_lock_notice', function( event, data ) {
				var notification, code = 'changeset_locked';
				if ( ! data.customize_changeset_lock_user ) {
					return;
				}

				// Update notification when a different user takes over.
				notification = api.notifications( code );
				if ( notification && notification.lockUser.id !== api.settings.changeset.lockUser.id ) {
					api.notifications.remove( code );
				}

				startLock( {
					lockUser: data.customize_changeset_lock_user
				} );
			} );

			// Handle locking in response to changeset save errors.
			api.bind( 'error', function( response ) {
				if ( 'changeset_locked' === response.code && response.lock_user ) {
					startLock( {
						lockUser: response.lock_user
					} );
				}
			} );
		} )();

		// Set up initial notifications.
		(function() {
			var removedQueryParams = [], autosaveDismissed = false;

			/**
			 * Obtain the URL to restore the autosave.
			 *
			 * @return {string} Customizer URL.
			 */
			function getAutosaveRestorationUrl() {
				var urlParser, queryParams;
				urlParser = document.createElement( 'a' );
				urlParser.href = location.href;
				queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
				if ( api.settings.changeset.latestAutoDraftUuid ) {
					queryParams.changeset_uuid = api.settings.changeset.latestAutoDraftUuid;
				} else {
					queryParams.customize_autosaved = 'on';
				}
				queryParams['return'] = api.settings.url['return'];
				urlParser.search = $.param( queryParams );
				return urlParser.href;
			}

			/**
			 * Remove parameter from the URL.
			 *
			 * @param {Array} params - Parameter names to remove.
			 * @return {void}
			 */
			function stripParamsFromLocation( params ) {
				var urlParser = document.createElement( 'a' ), queryParams, strippedParams = 0;
				urlParser.href = location.href;
				queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
				_.each( params, function( param ) {
					if ( 'undefined' !== typeof queryParams[ param ] ) {
						strippedParams += 1;
						delete queryParams[ param ];
					}
				} );
				if ( 0 === strippedParams ) {
					return;
				}

				urlParser.search = $.param( queryParams );
				history.replaceState( {}, document.title, urlParser.href );
			}

			/**
			 * Displays a Site Editor notification when a block theme is activated.
			 *
			 * @since 4.9.0
			 *
			 * @param {string} [notification] - A notification to display.
			 * @return {void}
			 */
			function addSiteEditorNotification( notification ) {
				api.notifications.add( new api.Notification( 'site_editor_block_theme_notice', {
					message: notification,
					type: 'info',
					dismissible: false,
					render: function() {
						var notification = api.Notification.prototype.render.call( this ),
							button = notification.find( 'button.switch-to-editor' );

						button.on( 'click', function( event ) {
							event.preventDefault();
							location.assign( button.data( 'action' ) );
						} );

						return notification;
					}
				} ) );
			}

			/**
			 * Dismiss autosave.
			 *
			 * @return {void}
			 */
			function dismissAutosave() {
				if ( autosaveDismissed ) {
					return;
				}
				wp.ajax.post( 'customize_dismiss_autosave_or_lock', {
					wp_customize: 'on',
					customize_theme: api.settings.theme.stylesheet,
					customize_changeset_uuid: api.settings.changeset.uuid,
					nonce: api.settings.nonce.dismiss_autosave_or_lock,
					dismiss_autosave: true
				} );
				autosaveDismissed = true;
			}

			/**
			 * Add notification regarding the availability of an autosave to restore.
			 *
			 * @return {void}
			 */
			function addAutosaveRestoreNotification() {
				var code = 'autosave_available', onStateChange;

				// Since there is an autosave revision and the user hasn't loaded with autosaved, add notification to prompt to load autosaved version.
				api.notifications.add( new api.Notification( code, {
					message: api.l10n.autosaveNotice,
					type: 'warning',
					dismissible: true,
					render: function() {
						var li = api.Notification.prototype.render.call( this ), link;

						// Handle clicking on restoration link.
						link = li.find( 'a' );
						link.prop( 'href', getAutosaveRestorationUrl() );
						link.on( 'click', function( event ) {
							event.preventDefault();
							location.replace( getAutosaveRestorationUrl() );
						} );

						// Handle dismissal of notice.
						li.find( '.notice-dismiss' ).on( 'click', dismissAutosave );

						return li;
					}
				} ) );

				// Remove the notification once the user starts making changes.
				onStateChange = function() {
					dismissAutosave();
					api.notifications.remove( code );
					api.unbind( 'change', onStateChange );
					api.state( 'changesetStatus' ).unbind( onStateChange );
				};
				api.bind( 'change', onStateChange );
				api.state( 'changesetStatus' ).bind( onStateChange );
			}

			if ( api.settings.changeset.autosaved ) {
				api.state( 'saved' ).set( false );
				removedQueryParams.push( 'customize_autosaved' );
			}
			if ( ! api.settings.changeset.branching && ( ! api.settings.changeset.status || 'auto-draft' === api.settings.changeset.status ) ) {
				removedQueryParams.push( 'changeset_uuid' ); // Remove UUID when restoring autosave auto-draft.
			}
			if ( removedQueryParams.length > 0 ) {
				stripParamsFromLocation( removedQueryParams );
			}
			if ( api.settings.changeset.latestAutoDraftUuid || api.settings.changeset.hasAutosaveRevision ) {
				addAutosaveRestoreNotification();
			}
			var shouldDisplayBlockThemeNotification = !! parseInt( $( '#customize-info' ).data( 'block-theme' ), 10 );
			if (shouldDisplayBlockThemeNotification) {
				addSiteEditorNotification( api.l10n.blockThemeNotification );
			}
		})();

		// Check if preview url is valid and load the preview frame.
		if ( api.previewer.previewUrl() ) {
			api.previewer.refresh();
		} else {
			api.previewer.previewUrl( api.settings.url.home );
		}

		// Button bindings.
		saveBtn.on( 'click', function( event ) {
			api.previewer.save();
			event.preventDefault();
		}).on( 'keydown', function( event ) {
			if ( 9 === event.which ) { // Tab.
				return;
			}
			if ( 13 === event.which ) { // Enter.
				api.previewer.save();
			}
			event.preventDefault();
		});

		closeBtn.on( 'keydown', function( event ) {
			if ( 9 === event.which ) { // Tab.
				return;
			}
			if ( 13 === event.which ) { // Enter.
				this.click();
			}
			event.preventDefault();
		});

		$( '.collapse-sidebar' ).on( 'click', function() {
			api.state( 'paneVisible' ).set( ! api.state( 'paneVisible' ).get() );
		});

		api.state( 'paneVisible' ).bind( function( paneVisible ) {
			overlay.toggleClass( 'preview-only', ! paneVisible );
			overlay.toggleClass( 'expanded', paneVisible );
			overlay.toggleClass( 'collapsed', ! paneVisible );

			if ( ! paneVisible ) {
				$( '.collapse-sidebar' ).attr({ 'aria-expanded': 'false', 'aria-label': api.l10n.expandSidebar });
			} else {
				$( '.collapse-sidebar' ).attr({ 'aria-expanded': 'true', 'aria-label': api.l10n.collapseSidebar });
			}
		});

		// Keyboard shortcuts - esc to exit section/panel.
		body.on( 'keydown', function( event ) {
			var collapsedObject, expandedControls = [], expandedSections = [], expandedPanels = [];

			if ( 27 !== event.which ) { // Esc.
				return;
			}

			/*
			 * Abort if the event target is not the body (the default) and not inside of #customize-controls.
			 * This ensures that ESC meant to collapse a modal dialog or a TinyMCE toolbar won't collapse something else.
			 */
			if ( ! $( event.target ).is( 'body' ) && ! $.contains( $( '#customize-controls' )[0], event.target ) ) {
				return;
			}

			// Abort if we're inside of a block editor instance.
			if ( event.target.closest( '.block-editor-writing-flow' ) !== null ||
				event.target.closest( '.block-editor-block-list__block-popover' ) !== null
			) {
				return;
			}

			// Check for expanded expandable controls (e.g. widgets and nav menus items), sections, and panels.
			api.control.each( function( control ) {
				if ( control.expanded && control.expanded() && _.isFunction( control.collapse ) ) {
					expandedControls.push( control );
				}
			});
			api.section.each( function( section ) {
				if ( section.expanded() ) {
					expandedSections.push( section );
				}
			});
			api.panel.each( function( panel ) {
				if ( panel.expanded() ) {
					expandedPanels.push( panel );
				}
			});

			// Skip collapsing expanded controls if there are no expanded sections.
			if ( expandedControls.length > 0 && 0 === expandedSections.length ) {
				expandedControls.length = 0;
			}

			// Collapse the most granular expanded object.
			collapsedObject = expandedControls[0] || expandedSections[0] || expandedPanels[0];
			if ( collapsedObject ) {
				if ( 'themes' === collapsedObject.params.type ) {

					// Themes panel or section.
					if ( body.hasClass( 'modal-open' ) ) {
						collapsedObject.closeDetails();
					} else if ( api.panel.has( 'themes' ) ) {

						// If we're collapsing a section, collapse the panel also.
						api.panel( 'themes' ).collapse();
					}
					return;
				}
				collapsedObject.collapse();
				event.preventDefault();
			}
		});

		$( '.customize-controls-preview-toggle' ).on( 'click', function() {
			api.state( 'paneVisible' ).set( ! api.state( 'paneVisible' ).get() );
		});

		/*
		 * Sticky header feature.
		 */
		(function initStickyHeaders() {
			var parentContainer = $( '.wp-full-overlay-sidebar-content' ),
				changeContainer, updateHeaderHeight, releaseStickyHeader, resetStickyHeader, positionStickyHeader,
				activeHeader, lastScrollTop;

			/**
			 * Determine which panel or section is currently expanded.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @param {wp.customize.Panel|wp.customize.Section} container Construct.
			 * @return {void}
			 */
			changeContainer = function( container ) {
				var newInstance = container,
					expandedSection = api.state( 'expandedSection' ).get(),
					expandedPanel = api.state( 'expandedPanel' ).get(),
					headerElement;

				if ( activeHeader && activeHeader.element ) {
					// Release previously active header element.
					releaseStickyHeader( activeHeader.element );

					// Remove event listener in the previous panel or section.
					activeHeader.element.find( '.description' ).off( 'toggled', updateHeaderHeight );
				}

				if ( ! newInstance ) {
					if ( ! expandedSection && expandedPanel && expandedPanel.contentContainer ) {
						newInstance = expandedPanel;
					} else if ( ! expandedPanel && expandedSection && expandedSection.contentContainer ) {
						newInstance = expandedSection;
					} else {
						activeHeader = false;
						return;
					}
				}

				headerElement = newInstance.contentContainer.find( '.customize-section-title, .panel-meta' ).first();
				if ( headerElement.length ) {
					activeHeader = {
						instance: newInstance,
						element:  headerElement,
						parent:   headerElement.closest( '.customize-pane-child' ),
						height:   headerElement.outerHeight()
					};

					// Update header height whenever help text is expanded or collapsed.
					activeHeader.element.find( '.description' ).on( 'toggled', updateHeaderHeight );

					if ( expandedSection ) {
						resetStickyHeader( activeHeader.element, activeHeader.parent );
					}
				} else {
					activeHeader = false;
				}
			};
			api.state( 'expandedSection' ).bind( changeContainer );
			api.state( 'expandedPanel' ).bind( changeContainer );

			// Throttled scroll event handler.
			parentContainer.on( 'scroll', _.throttle( function() {
				if ( ! activeHeader ) {
					return;
				}

				var scrollTop = parentContainer.scrollTop(),
					scrollDirection;

				if ( ! lastScrollTop ) {
					scrollDirection = 1;
				} else {
					if ( scrollTop === lastScrollTop ) {
						scrollDirection = 0;
					} else if ( scrollTop > lastScrollTop ) {
						scrollDirection = 1;
					} else {
						scrollDirection = -1;
					}
				}
				lastScrollTop = scrollTop;
				if ( 0 !== scrollDirection ) {
					positionStickyHeader( activeHeader, scrollTop, scrollDirection );
				}
			}, 8 ) );

			// Update header position on sidebar layout change.
			api.notifications.bind( 'sidebarTopUpdated', function() {
				if ( activeHeader && activeHeader.element.hasClass( 'is-sticky' ) ) {
					activeHeader.element.css( 'top', parentContainer.css( 'top' ) );
				}
			});

			// Release header element if it is sticky.
			releaseStickyHeader = function( headerElement ) {
				if ( ! headerElement.hasClass( 'is-sticky' ) ) {
					return;
				}
				headerElement
					.removeClass( 'is-sticky' )
					.addClass( 'maybe-sticky is-in-view' )
					.css( 'top', parentContainer.scrollTop() + 'px' );
			};

			// Reset position of the sticky header.
			resetStickyHeader = function( headerElement, headerParent ) {
				if ( headerElement.hasClass( 'is-in-view' ) ) {
					headerElement
						.removeClass( 'maybe-sticky is-in-view' )
						.css( {
							width: '',
							top:   ''
						} );
					headerParent.css( 'padding-top', '' );
				}
			};

			/**
			 * Update active header height.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @return {void}
			 */
			updateHeaderHeight = function() {
				activeHeader.height = activeHeader.element.outerHeight();
			};

			/**
			 * Reposition header on throttled `scroll` event.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @param {Object} header - Header.
			 * @param {number} scrollTop - Scroll top.
			 * @param {number} scrollDirection - Scroll direction, negative number being up and positive being down.
			 * @return {void}
			 */
			positionStickyHeader = function( header, scrollTop, scrollDirection ) {
				var headerElement = header.element,
					headerParent = header.parent,
					headerHeight = header.height,
					headerTop = parseInt( headerElement.css( 'top' ), 10 ),
					maybeSticky = headerElement.hasClass( 'maybe-sticky' ),
					isSticky = headerElement.hasClass( 'is-sticky' ),
					isInView = headerElement.hasClass( 'is-in-view' ),
					isScrollingUp = ( -1 === scrollDirection );

				// When scrolling down, gradually hide sticky header.
				if ( ! isScrollingUp ) {
					if ( isSticky ) {
						headerTop = scrollTop;
						headerElement
							.removeClass( 'is-sticky' )
							.css( {
								top:   headerTop + 'px',
								width: ''
							} );
					}
					if ( isInView && scrollTop > headerTop + headerHeight ) {
						headerElement.removeClass( 'is-in-view' );
						headerParent.css( 'padding-top', '' );
					}
					return;
				}

				// Scrolling up.
				if ( ! maybeSticky && scrollTop >= headerHeight ) {
					maybeSticky = true;
					headerElement.addClass( 'maybe-sticky' );
				} else if ( 0 === scrollTop ) {
					// Reset header in base position.
					headerElement
						.removeClass( 'maybe-sticky is-in-view is-sticky' )
						.css( {
							top:   '',
							width: ''
						} );
					headerParent.css( 'padding-top', '' );
					return;
				}

				if ( isInView && ! isSticky ) {
					// Header is in the view but is not yet sticky.
					if ( headerTop >= scrollTop ) {
						// Header is fully visible.
						headerElement
							.addClass( 'is-sticky' )
							.css( {
								top:   parentContainer.css( 'top' ),
								width: headerParent.outerWidth() + 'px'
							} );
					}
				} else if ( maybeSticky && ! isInView ) {
					// Header is out of the view.
					headerElement
						.addClass( 'is-in-view' )
						.css( 'top', ( scrollTop - headerHeight ) + 'px' );
					headerParent.css( 'padding-top', headerHeight + 'px' );
				}
			};
		}());

		// Previewed device bindings. (The api.previewedDevice property
		// is how this Value was first introduced, but since it has moved to api.state.)
		api.previewedDevice = api.state( 'previewedDevice' );

		// Set the default device.
		api.bind( 'ready', function() {
			_.find( api.settings.previewableDevices, function( value, key ) {
				if ( true === value['default'] ) {
					api.previewedDevice.set( key );
					return true;
				}
			} );
		} );

		// Set the toggled device.
		footerActions.find( '.devices button' ).on( 'click', function( event ) {
			api.previewedDevice.set( $( event.currentTarget ).data( 'device' ) );
		});

		// Bind device changes.
		api.previewedDevice.bind( function( newDevice ) {
			var overlay = $( '.wp-full-overlay' ),
				devices = '';

			footerActions.find( '.devices button' )
				.removeClass( 'active' )
				.attr( 'aria-pressed', false );

			footerActions.find( '.devices .preview-' + newDevice )
				.addClass( 'active' )
				.attr( 'aria-pressed', true );

			$.each( api.settings.previewableDevices, function( device ) {
				devices += ' preview-' + device;
			} );

			overlay
				.removeClass( devices )
				.addClass( 'preview-' + newDevice );
		} );

		// Bind site title display to the corresponding field.
		if ( title.length ) {
			api( 'blogname', function( setting ) {
				var updateTitle = function() {
					var blogTitle = setting() || '';
					title.text( blogTitle.toString().trim() || api.l10n.untitledBlogName );
				};
				setting.bind( updateTitle );
				updateTitle();
			} );
		}

		/*
		 * Create a postMessage connection with a parent frame,
		 * in case the Customizer frame was opened with the Customize loader.
		 *
		 * @see wp.customize.Loader
		 */
		parent = new api.Messenger({
			url: api.settings.url.parent,
			channel: 'loader'
		});

		// Handle exiting of Customizer.
		(function() {
			var isInsideIframe = false;

			function isCleanState() {
				var defaultChangesetStatus;

				/*
				 * Handle special case of previewing theme switch since some settings (for nav menus and widgets)
				 * are pre-dirty and non-active themes can only ever be auto-drafts.
				 */
				if ( ! api.state( 'activated' ).get() ) {
					return 0 === api._latestRevision;
				}

				// Dirty if the changeset status has been changed but not saved yet.
				defaultChangesetStatus = api.state( 'changesetStatus' ).get();
				if ( '' === defaultChangesetStatus || 'auto-draft' === defaultChangesetStatus ) {
					defaultChangesetStatus = 'publish';
				}
				if ( api.state( 'selectedChangesetStatus' ).get() !== defaultChangesetStatus ) {
					return false;
				}

				// Dirty if scheduled but the changeset date hasn't been saved yet.
				if ( 'future' === api.state( 'selectedChangesetStatus' ).get() && api.state( 'selectedChangesetDate' ).get() !== api.state( 'changesetDate' ).get() ) {
					return false;
				}

				return api.state( 'saved' ).get() && 'auto-draft' !== api.state( 'changesetStatus' ).get();
			}

			/*
			 * If we receive a 'back' event, we're inside an iframe.
			 * Send any clicks to the 'Return' link to the parent page.
			 */
			parent.bind( 'back', function() {
				isInsideIframe = true;
			});

			function startPromptingBeforeUnload() {
				api.unbind( 'change', startPromptingBeforeUnload );
				api.state( 'selectedChangesetStatus' ).unbind( startPromptingBeforeUnload );
				api.state( 'selectedChangesetDate' ).unbind( startPromptingBeforeUnload );

				// Prompt user with AYS dialog if leaving the Customizer with unsaved changes.
				$( window ).on( 'beforeunload.customize-confirm', function() {
					if ( ! isCleanState() && ! api.state( 'changesetLocked' ).get() ) {
						setTimeout( function() {
							overlay.removeClass( 'customize-loading' );
						}, 1 );
						return api.l10n.saveAlert;
					}
				});
			}
			api.bind( 'change', startPromptingBeforeUnload );
			api.state( 'selectedChangesetStatus' ).bind( startPromptingBeforeUnload );
			api.state( 'selectedChangesetDate' ).bind( startPromptingBeforeUnload );

			function requestClose() {
				var clearedToClose = $.Deferred(), dismissAutoSave = false, dismissLock = false;

				if ( isCleanState() ) {
					dismissLock = true;
				} else if ( confirm( api.l10n.saveAlert ) ) {

					dismissLock = true;

					// Mark all settings as clean to prevent another call to requestChangesetUpdate.
					api.each( function( setting ) {
						setting._dirty = false;
					});
					$( document ).off( 'visibilitychange.wp-customize-changeset-update' );
					$( window ).off( 'beforeunload.wp-customize-changeset-update' );

					closeBtn.css( 'cursor', 'progress' );
					if ( '' !== api.state( 'changesetStatus' ).get() ) {
						dismissAutoSave = true;
					}
				} else {
					clearedToClose.reject();
				}

				if ( dismissLock || dismissAutoSave ) {
					wp.ajax.send( 'customize_dismiss_autosave_or_lock', {
						timeout: 500, // Don't wait too long.
						data: {
							wp_customize: 'on',
							customize_theme: api.settings.theme.stylesheet,
							customize_changeset_uuid: api.settings.changeset.uuid,
							nonce: api.settings.nonce.dismiss_autosave_or_lock,
							dismiss_autosave: dismissAutoSave,
							dismiss_lock: dismissLock
						}
					} ).always( function() {
						clearedToClose.resolve();
					} );
				}

				return clearedToClose.promise();
			}

			parent.bind( 'confirm-close', function() {
				requestClose().done( function() {
					parent.send( 'confirmed-close', true );
				} ).fail( function() {
					parent.send( 'confirmed-close', false );
				} );
			} );

			closeBtn.on( 'click.customize-controls-close', function( event ) {
				event.preventDefault();
				if ( isInsideIframe ) {
					parent.send( 'close' ); // See confirm-close logic above.
				} else {
					requestClose().done( function() {
						$( window ).off( 'beforeunload.customize-confirm' );
						window.location.href = closeBtn.prop( 'href' );
					} );
				}
			});
		})();

		// Pass events through to the parent.
		$.each( [ 'saved', 'change' ], function ( i, event ) {
			api.bind( event, function() {
				parent.send( event );
			});
		} );

		// Pass titles to the parent.
		api.bind( 'title', function( newTitle ) {
			parent.send( 'title', newTitle );
		});

		if ( api.settings.changeset.branching ) {
			parent.send( 'changeset-uuid', api.settings.changeset.uuid );
		}

		// Initialize the connection with the parent frame.
		parent.send( 'ready' );

		// Control visibility for default controls.
		$.each({
			'background_image': {
				controls: [ 'background_preset', 'background_position', 'background_size', 'background_repeat', 'background_attachment' ],
				callback: function( to ) { return !! to; }
			},
			'show_on_front': {
				controls: [ 'page_on_front', 'page_for_posts' ],
				callback: function( to ) { return 'page' === to; }
			},
			'header_textcolor': {
				controls: [ 'header_textcolor' ],
				callback: function( to ) { return 'blank' !== to; }
			}
		}, function( settingId, o ) {
			api( settingId, function( setting ) {
				$.each( o.controls, function( i, controlId ) {
					api.control( controlId, function( control ) {
						var visibility = function( to ) {
							control.container.toggle( o.callback( to ) );
						};

						visibility( setting.get() );
						setting.bind( visibility );
					});
				});
			});
		});

		api.control( 'background_preset', function( control ) {
			var visibility, defaultValues, values, toggleVisibility, updateSettings, preset;

			visibility = { // position, size, repeat, attachment.
				'default': [ false, false, false, false ],
				'fill': [ true, false, false, false ],
				'fit': [ true, false, true, false ],
				'repeat': [ true, false, false, true ],
				'custom': [ true, true, true, true ]
			};

			defaultValues = [
				_wpCustomizeBackground.defaults['default-position-x'],
				_wpCustomizeBackground.defaults['default-position-y'],
				_wpCustomizeBackground.defaults['default-size'],
				_wpCustomizeBackground.defaults['default-repeat'],
				_wpCustomizeBackground.defaults['default-attachment']
			];

			values = { // position_x, position_y, size, repeat, attachment.
				'default': defaultValues,
				'fill': [ 'left', 'top', 'cover', 'no-repeat', 'fixed' ],
				'fit': [ 'left', 'top', 'contain', 'no-repeat', 'fixed' ],
				'repeat': [ 'left', 'top', 'auto', 'repeat', 'scroll' ]
			};

			// @todo These should actually toggle the active state,
			// but without the preview overriding the state in data.activeControls.
			toggleVisibility = function( preset ) {
				_.each( [ 'background_position', 'background_size', 'background_repeat', 'background_attachment' ], function( controlId, i ) {
					var control = api.control( controlId );
					if ( control ) {
						control.container.toggle( visibility[ preset ][ i ] );
					}
				} );
			};

			updateSettings = function( preset ) {
				_.each( [ 'background_position_x', 'background_position_y', 'background_size', 'background_repeat', 'background_attachment' ], function( settingId, i ) {
					var setting = api( settingId );
					if ( setting ) {
						setting.set( values[ preset ][ i ] );
					}
				} );
			};

			preset = control.setting.get();
			toggleVisibility( preset );

			control.setting.bind( 'change', function( preset ) {
				toggleVisibility( preset );
				if ( 'custom' !== preset ) {
					updateSettings( preset );
				}
			} );
		} );

		api.control( 'background_repeat', function( control ) {
			control.elements[0].unsync( api( 'background_repeat' ) );

			control.element = new api.Element( control.container.find( 'input' ) );
			control.element.set( 'no-repeat' !== control.setting() );

			control.element.bind( function( to ) {
				control.setting.set( to ? 'repeat' : 'no-repeat' );
			} );

			control.setting.bind( function( to ) {
				control.element.set( 'no-repeat' !== to );
			} );
		} );

		api.control( 'background_attachment', function( control ) {
			control.elements[0].unsync( api( 'background_attachment' ) );

			control.element = new api.Element( control.container.find( 'input' ) );
			control.element.set( 'fixed' !== control.setting() );

			control.element.bind( function( to ) {
				control.setting.set( to ? 'scroll' : 'fixed' );
			} );

			control.setting.bind( function( to ) {
				control.element.set( 'fixed' !== to );
			} );
		} );

		// Juggle the two controls that use header_textcolor.
		api.control( 'display_header_text', function( control ) {
			var last = '';

			control.elements[0].unsync( api( 'header_textcolor' ) );

			control.element = new api.Element( control.container.find('input') );
			control.element.set( 'blank' !== control.setting() );

			control.element.bind( function( to ) {
				if ( ! to ) {
					last = api( 'header_textcolor' ).get();
				}

				control.setting.set( to ? last : 'blank' );
			});

			control.setting.bind( function( to ) {
				control.element.set( 'blank' !== to );
			});
		});

		// Add behaviors to the static front page controls.
		api( 'show_on_front', 'page_on_front', 'page_for_posts', function( showOnFront, pageOnFront, pageForPosts ) {
			var handleChange = function() {
				var setting = this, pageOnFrontId, pageForPostsId, errorCode = 'show_on_front_page_collision';
				pageOnFrontId = parseInt( pageOnFront(), 10 );
				pageForPostsId = parseInt( pageForPosts(), 10 );

				if ( 'page' === showOnFront() ) {

					// Change previewed URL to the homepage when changing the page_on_front.
					if ( setting === pageOnFront && pageOnFrontId > 0 ) {
						api.previewer.previewUrl.set( api.settings.url.home );
					}

					// Change the previewed URL to the selected page when changing the page_for_posts.
					if ( setting === pageForPosts && pageForPostsId > 0 ) {
						api.previewer.previewUrl.set( api.settings.url.home + '?page_id=' + pageForPostsId );
					}
				}

				// Toggle notification when the homepage and posts page are both set and the same.
				if ( 'page' === showOnFront() && pageOnFrontId && pageForPostsId && pageOnFrontId === pageForPostsId ) {
					showOnFront.notifications.add( new api.Notification( errorCode, {
						type: 'error',
						message: api.l10n.pageOnFrontError
					} ) );
				} else {
					showOnFront.notifications.remove( errorCode );
				}
			};
			showOnFront.bind( handleChange );
			pageOnFront.bind( handleChange );
			pageForPosts.bind( handleChange );
			handleChange.call( showOnFront, showOnFront() ); // Make sure initial notification is added after loading existing changeset.

			// Move notifications container to the bottom.
			api.control( 'show_on_front', function( showOnFrontControl ) {
				showOnFrontControl.deferred.embedded.done( function() {
					showOnFrontControl.container.append( showOnFrontControl.getNotificationsContainerElement() );
				});
			});
		});

		// Add code editor for Custom CSS.
		(function() {
			var sectionReady = $.Deferred();

			api.section( 'custom_css', function( section ) {
				section.deferred.embedded.done( function() {
					if ( section.expanded() ) {
						sectionReady.resolve( section );
					} else {
						section.expanded.bind( function( isExpanded ) {
							if ( isExpanded ) {
								sectionReady.resolve( section );
							}
						} );
					}
				});
			});

			// Set up the section description behaviors.
			sectionReady.done( function setupSectionDescription( section ) {
				var control = api.control( 'custom_css' );

				// Hide redundant label for visual users.
				control.container.find( '.customize-control-title:first' ).addClass( 'screen-reader-text' );

				// Close the section description when clicking the close button.
				section.container.find( '.section-description-buttons .section-description-close' ).on( 'click', function() {
					section.container.find( '.section-meta .customize-section-description:first' )
						.removeClass( 'open' )
						.slideUp();

					section.container.find( '.customize-help-toggle' )
						.attr( 'aria-expanded', 'false' )
						.focus(); // Avoid focus loss.
				});

				// Reveal help text if setting is empty.
				if ( control && ! control.setting.get() ) {
					section.container.find( '.section-meta .customize-section-description:first' )
						.addClass( 'open' )
						.show()
						.trigger( 'toggled' );

					section.container.find( '.customize-help-toggle' ).attr( 'aria-expanded', 'true' );
				}
			});
		})();

		// Toggle visibility of Header Video notice when active state change.
		api.control( 'header_video', function( headerVideoControl ) {
			headerVideoControl.deferred.embedded.done( function() {
				var toggleNotice = function() {
					var section = api.section( headerVideoControl.section() ), noticeCode = 'video_header_not_available';
					if ( ! section ) {
						return;
					}
					if ( headerVideoControl.active.get() ) {
						section.notifications.remove( noticeCode );
					} else {
						section.notifications.add( new api.Notification( noticeCode, {
							type: 'info',
							message: api.l10n.videoHeaderNotice
						} ) );
					}
				};
				toggleNotice();
				headerVideoControl.active.bind( toggleNotice );
			} );
		} );

		// Update the setting validities.
		api.previewer.bind( 'selective-refresh-setting-validities', function handleSelectiveRefreshedSettingValidities( settingValidities ) {
			api._handleSettingValidities( {
				settingValidities: settingValidities,
				focusInvalidControl: false
			} );
		} );

		// Focus on the control that is associated with the given setting.
		api.previewer.bind( 'focus-control-for-setting', function( settingId ) {
			var matchedControls = [];
			api.control.each( function( control ) {
				var settingIds = _.pluck( control.settings, 'id' );
				if ( -1 !== _.indexOf( settingIds, settingId ) ) {
					matchedControls.push( control );
				}
			} );

			// Focus on the matched control with the lowest priority (appearing higher).
			if ( matchedControls.length ) {
				matchedControls.sort( function( a, b ) {
					return a.priority() - b.priority();
				} );
				matchedControls[0].focus();
			}
		} );

		// Refresh the preview when it requests.
		api.previewer.bind( 'refresh', function() {
			api.previewer.refresh();
		});

		// Update the edit shortcut visibility state.
		api.state( 'paneVisible' ).bind( function( isPaneVisible ) {
			var isMobileScreen;
			if ( window.matchMedia ) {
				isMobileScreen = window.matchMedia( 'screen and ( max-width: 640px )' ).matches;
			} else {
				isMobileScreen = $( window ).width() <= 640;
			}
			api.state( 'editShortcutVisibility' ).set( isPaneVisible || isMobileScreen ? 'visible' : 'hidden' );
		} );
		if ( window.matchMedia ) {
			window.matchMedia( 'screen and ( max-width: 640px )' ).addListener( function() {
				var state = api.state( 'paneVisible' );
				state.callbacks.fireWith( state, [ state.get(), state.get() ] );
			} );
		}
		api.previewer.bind( 'edit-shortcut-visibility', function( visibility ) {
			api.state( 'editShortcutVisibility' ).set( visibility );
		} );
		api.state( 'editShortcutVisibility' ).bind( function( visibility ) {
			api.previewer.send( 'edit-shortcut-visibility', visibility );
		} );

		// Autosave changeset.
		function startAutosaving() {
			var timeoutId, updateChangesetWithReschedule, scheduleChangesetUpdate, updatePending = false;

			api.unbind( 'change', startAutosaving ); // Ensure startAutosaving only fires once.

			function onChangeSaved( isSaved ) {
				if ( ! isSaved && ! api.settings.changeset.autosaved ) {
					api.settings.changeset.autosaved = true; // Once a change is made then autosaving kicks in.
					api.previewer.send( 'autosaving' );
				}
			}
			api.state( 'saved' ).bind( onChangeSaved );
			onChangeSaved( api.state( 'saved' ).get() );

			/**
			 * Request changeset update and then re-schedule the next changeset update time.
			 *
			 * @since 4.7.0
			 * @private
			 */
			updateChangesetWithReschedule = function() {
				if ( ! updatePending ) {
					updatePending = true;
					api.requestChangesetUpdate( {}, { autosave: true } ).always( function() {
						updatePending = false;
					} );
				}
				scheduleChangesetUpdate();
			};

			/**
			 * Schedule changeset update.
			 *
			 * @since 4.7.0
			 * @private
			 */
			scheduleChangesetUpdate = function() {
				clearTimeout( timeoutId );
				timeoutId = setTimeout( function() {
					updateChangesetWithReschedule();
				}, api.settings.timeouts.changesetAutoSave );
			};

			// Start auto-save interval for updating changeset.
			scheduleChangesetUpdate();

			// Save changeset when focus removed from window.
			$( document ).on( 'visibilitychange.wp-customize-changeset-update', function() {
				if ( document.hidden ) {
					updateChangesetWithReschedule();
				}
			} );

			// Save changeset before unloading window.
			$( window ).on( 'beforeunload.wp-customize-changeset-update', function() {
				updateChangesetWithReschedule();
			} );
		}
		api.bind( 'change', startAutosaving );

		// Make sure TinyMCE dialogs appear above Customizer UI.
		$( document ).one( 'tinymce-editor-setup', function() {
			if ( window.tinymce.ui.FloatPanel && ( ! window.tinymce.ui.FloatPanel.zIndex || window.tinymce.ui.FloatPanel.zIndex < 500001 ) ) {
				window.tinymce.ui.FloatPanel.zIndex = 500001;
			}
		} );

		body.addClass( 'ready' );
		api.trigger( 'ready' );
	});

})( wp, jQuery );

京都の外壁塗装で選ぶべき評判・口コミの良い業者ランキング【2021年】

京都の外壁塗装で選ぶべき評判・口コミの良い業者ランキング【2021年】

京都の外壁塗装業者ランキング
京都の外壁塗装業者を評判・口コミから厳選

京都の外壁塗装業者を徹底調査!

京都で評判の良いおすすめ外壁塗装業者ランキング!

京都で評判・口コミの良い外壁塗装業者ランキング!

こんにちは、「京都のおすすめ外壁塗装業者を実績・評判から厳選して10社ご紹介」の管理人です。
この度は当サイトをご覧いただきき、本当にありがとうございます。

このサイトでは、京都で生まれ育った管理人である私が、地元である京都の優良外壁塗装業者をご紹介しています。
京都にお住まいの方で、外壁塗装を検討されている方にとって少しでもお役に立てれば幸いです。

まず、なぜ私が「京都の優良外壁塗装業者」を紹介しようと思ったのか? 手短にご説明させていただきます。

実は最近、たくさんの思い出が詰まった我が家の外壁塗装工事を行いました。

築年数は約20年程。 築20年を超えたくらいのタイミングで塗り替えをしないと家の寿命が短くなってしまうと聞いたこと。
そして何より、この20年一切外壁には手をかけていなかったので、汚れが目立ち美観がすごく悪くなっていたこと。
これが初めて外壁塗装の塗り替えを検討するきっかけとなりました。

私は性格的に凝り性で、何でも自分で調べないと気が済まない性格です。
自分が納得するまで徹底的に調査して、どこよりも良い塗装業者さんを見つけて塗り替えをしてもらおう!と意気込みました。

幸いにも、私は職業柄、そして長年京都に住み続けていることもあり、建築関係(大工さん・建築士さん・設計士さんなど)の知人が複数います。
実際に行った調査方法として、その建築関係の知人と直接会い、徹底的に塗装業界を含む建築業界の生の声を聞き込みました。

その結果、納得・安心して塗り替えをお願いできる塗装業者さんと出会うことができ、仕上がり・工事金額ともに満足のいく塗り替えをすることができました。

私と同じように、

・大切な家だからこそ、丁寧にしっかりと外壁塗装をしてほしい
・少しでも安くなれば嬉しいけど、手抜き工事はされたくない
・しっかり工事内容を説明してくれるような、信頼できる塗装業者を見つけたい

とお考えの方は、きっとこのサイトが京都での塗装業者探しの参考になると信じております。

ぜひ、京都にお住まいの方で、外壁塗装を検討されている方、優良塗装業者をお探しの方の参考にしてください。

京都で信頼できる外壁塗装業者を選ぶポイント

京都で信頼できる外壁塗装業者を選ぶポイント

今回、私が「優良外壁塗装業者の定義」として挙げたポイントは以下の3点です。

① 良心的な外壁塗装の金額設定
② 塗り替えの施工技術のレベルが高い
③ 対応品質・サポートがしっかりしている

恐らく皆さんにとっても、上記3点が揃っていれば優良塗装業者と言えるでしょう。
しかし、京都にも外壁塗装業者は数多くありますが、上記全てを満たす塗装業者というのは実は非常に少ないのです。

「値段が安くても、塗装工事自体の品質が悪い」
「仕上がりはすごく良いけど、工事金額が相場より明らかに高額」
「会社の規模は大きいが、施工は全て下請けに丸投げで対応が雑or下請け任せ」
など、どれか1つの項目は満たしても、他のポイントが良くないという塗装業者が圧倒的に多いのが現状です。

それでは、「優良外壁塗装業者の定義」をもう少し掘り下げてご説明します。

良心的な外壁塗装工事の金額設定

良心的な外壁塗装工事の金額設定

良心的な金額設定は、やはり皆さん重視したいポイントではないでしょうか?
私自身もここは絶対に外せないポイントでした。

一般的な戸建住宅の外壁塗装の価格相場は、おおよそ80万〜120万円とされています。
しかし、ただ安ければ良いという訳でない、施工品質が伴わないといけない、というのが難しいポイントです。

良心的な工事金額、その中で最大限高品質な塗り替えを行ってくれる塗装業者を見極めるポイント
それは、

営業マンやCM・チラシなど、過剰な営業費・宣伝広告費を使っていないかどうか、です。

外壁塗装業界は、大手メーカーから地元密着型の小さな塗装業者まで、お客さんの奪い合い状態となっています。
そのため、多くの塗装業者が他社より少しでも知名度を上げるため、少しでも多くのお客さんに知ってもらうために、多額の営業費・宣伝広告費を使っています。
大手メーカーであればCM、小さな塗装業者でも新聞チラシ、そして多くの営業マンを雇い、訪問販売による営業活動を行なっているのです。

もちろん塗装業者も生活がかかっているので、営業・宣伝を行い、少しでも仕事を受注しようとするのは当然です。
しかし問題は、多額の営業費・宣伝広告費は皆さんがお支払いになる工事代金に含まれる、という点です。

過剰な営業費・宣伝広告費を使っている塗装業者は、総じて塗り替えの工事金額が高額になりがちです。
こうなると、「なぜ私たちが工事には直接関係の無い営業費・宣伝広告費を支払わないといけないのか」と思ってしまいますよね。

本当に優良な塗装業者なら、広告を出したり営業マンを雇ったりしなくても評判・口コミでお客さんは自然と集まるのです。
ただでさえ価格相場の幅が広く、工事金額の内訳がわかりにくい外壁塗装です。
気になった塗装業者が、営業マンを雇っていないか、過剰な広告を出していないか、確認してみましょう。

塗り替えの施工技術のレベルが高い

塗り替えの施工技術のレベルが高い

施工技術・施工品質に関しては、気にはなりますがわかりにくいポイントです。
私もそうでしたが、普段塗装工事に馴染みが無い一般の方からすれば、実際に施工している姿を見ても、技術の良し悪しを見極めるのは難しいのです。

ここで1つの見極めポイントとなるのが、「一級塗装技能士」という資格です。

この「一級塗装技能士」は、塗装の実技試験と学科試験の両方に合格した塗装職人のみが持っている資格になります。
もちろんこれは国家資格です

資格を持っていない塗装職人さんでも、技術力が高い職人さんは沢山いらっしゃると思いますが、少なくともこの資格を持つ塗装職人さんは、一定水準以上の技術・知識を持つ塗装職人だと国から認められているのです。
気になった塗装業者に「一級塗装技能士」の取得者がいるのか、ぜひ確認しておきましょう。

塗装工事以外にも接客対応・サポートがしっかりしている

塗装工事以外にも対応・サポートがしっかりしている

外壁塗装を検討されている方の中で、外壁塗装について精通してるという方は少ないと思います。
なぜなら、外壁塗装の塗り替え周期は10~20年に一度、知らなくても当然なのです。
むしろ私のように、「初めて外壁塗装を検討している」という人の方が多いかもしれません。

一般の方が馴染みが薄い外壁塗装工事だからこそ、対応品質・サポートがしっかりしている塗装業者の方が安心して施工を任せられるでしょう。

打ち合わせや現地調査、見積もりの段階で、「わからないことはないか?心配な点はないか?」など、気遣ってくれる塗装業者は本当に心強いです。
初めて塗り替え工事を行う方なら、尚更安心して工事を任せることができます。
こちらの些細な疑問・質問にも、丁寧にしっかり対応してくれる塗装業者を選ぶようにしましょう。

また、不思議と対応品質が良い塗装業者は、総じて塗り替えの施工品質も高いです。
やはり、真面目に誠実に塗装と向き合っている業者は、その真面目さ・誠実さが対応品質にも現れるということですね。

京都で評判の良い外壁塗装業者はどこ?

京都で評判の良い外壁塗装業者はどこ?

以上のことを踏まえた上で私は、複数の塗装業者から見積もりをいただき、じっくりと見積書を比較検討し、塗装業者を吟味しました。
そしてその結果、京都の中でも大変素晴らしい外壁塗装業者さんと出会うことができ、仕上がり・価格ともに満足のいく外壁塗装工事をしていただくことができました。

ここでは、私が実際に塗り替えを依頼した塗装業者さんをはじめ、

・見積もりを依頼したり問い合わせたりした際に「3つの優良外壁塗装業者の定義を満たしている」と感じた塗装業者さん
・建築業界に在籍している知人の中で評判の良い塗装業者さん

この2点を含めた、京都で安心して塗装工事を任せることができる優良外壁塗装業者さんをランキング形式でご紹介させていただきます。

ぜひ京都にお住まいの方は、優良外壁塗装業者探しの参考にしてください。

京都で評判・口コミの良い外壁塗装業者ランキング
ランキング1位

京都で評判・口コミの良い外壁塗装業者ランキング

株式会社ウェルビーホーム

京都でおすすめの優良外壁塗装業者|株式会社ウェルビーホーム

株式会社ウェルビーホームさんの特徴

今回、私が実際に外壁塗装の塗り替えを依頼し、最も皆さんにもおすすめしたい外壁塗装業者さんは、「株式会社ウェルビーホーム」さんです。

ウェルビーホームさんは、代表の高橋さんが直接打ち合わせ・現場調査から実際の施工、そして工事後のアフターフォローまで全て対応してくれます。
また、高橋さんは建築士の資格も持っており、外壁塗装だけでなく住まいのこと全般に精通しておられるので、様々な観点から外壁塗装に関するアドバイスをしてくれます。
高橋さん自身とても笑顔の素敵な物腰の優しい方で、外壁塗装以外の住まいに関する質問にも、とてもわかりやすく丁寧に答えてくださいました。

見積書も、他のどの業者さんよりも丁寧で詳細に作ってくださり、工事内容が非常に明確で安心できたのがウェルビーホームさんを選んだ大きなポイントです。
さらに、ウェルビーホームさんは「一級塗装技能士」の資格を所持する職人さんが在籍しています。
施工してくれた職人さん方もとても愛想良くマナーもしっかりしており、塗り替えの仕上がり・接客応対ともに大満足の結果でした。

工事金額も他業者さんと比べても安価でしたし、是非とも京都で外壁塗装を検討されている方におすすめしたい優良塗装業者さんです。

株式会社ウェルビーホームさんを利用した方の評判・口コミ

40代・女性・京都市中京区在住

外壁塗装が初めての私にも非常に丁寧にご説明くださいました。
打ち合わせの時点から高橋社長の人柄の良さは伝わりました。
見積書の内容も細かく教えてくださり、初めての外壁塗装も安心して行えました、ありがとうございました。

50代・男性・京都府城陽市在住

問い合わせから施工までやりとりがとてもスムーズでした。
特に問い合わせから現地確認までの対応の早さは一番でした。
カラーシミュレーションなど、色決めも早かったです。
仕上がりも綺麗で大満足です。

50代・女性・大阪府寝屋川市在住

前回の工事代金より大幅に安かったので大変驚きました。
こんなことなら前回の塗装工事もウェルビーホームさんにお願いしたかったです。
次回の塗装もお願いしたいので、その際はよろしくお願いします。

京都で評判・口コミの良い外壁塗装業者ランキング
ランキング2位

京都で評判・口コミの良い外壁塗装業者ランキング

株式会社 佐藤塗装店

京都でおすすめの優良外壁塗装業者|株式会社 佐藤塗装店

株式会社 佐藤塗装店さんの特徴

「株式会社 佐藤塗装店」さんは、京都市西京区を中心に京都府全域、大阪府、滋賀県、奈良県と幅広いエリアで活躍する塗装業者さんです。

代表の佐藤さんは、「一級塗装技能士」の資格をはじめ、「一級左官技能士」「足場組立作業主任者」など、数多くの資格を有しておられます。
塗り替えを依頼する塗装業者さんが塗装だけでなく他の建築工事に関して精通していると、幅広い視点で的確なアドバイスをもらえるので嬉しいポイントです。

佐藤塗装店さんは、日本ペイント株式会社の特約店であり、使用する塗料も日本ペイントが主になりますので、塗料の単価や性能など、工事内容が非常に明確です。
見積もりの内容も分かりやすく明瞭会計で、職人さんの対応も非常に丁寧です。
京都の数ある塗装業者の中でも、5指に入る優良塗装業者さんです。

株式会社 佐藤塗装店さんを利用した方の評判・口コミ

50代・男性・京都市西京区在住

日本ペイントの塗料と聞いて安心しましたし、塗料の知識が豊富な営業さんで、勉強になりました。
価格がわかりやすく、日本ペイントの塗料を使用しているとのことで、決めました。
仕上がりにも大変満足です。

50代・女性・兵庫県神戸市在住

住まいのイメージを変えたく、相談に乗っていただきました。
熱心に対応して頂き、次回もお願いしたいと思います。
ありがとうございました。

40代・女性・大阪府堺市在住

塗装後玄関周りの色が気に入らず、再度塗り替えて頂き有難うございました。
大満足です。ご近所様をご紹介させて頂きます。

京都で評判・口コミの良い外壁塗装業者ランキング
ランキング3位

京都で評判・口コミの良い外壁塗装業者ランキング

株式会社 伊藤建装

京都でおすすめの優良外壁塗装業者|株式会社 伊藤建装

株式会社 伊藤建装さんの特徴

「株式会社 伊藤建装」さんは、京都市伏見区を中心に京都府・滋賀県・大阪府北部で活躍する塗装業者さんです。

「一級塗装技能士」の資格保有者だけでなく、外壁診断士や外壁アドバイザーなどの資格保有者が複数在籍しておられ、まさに外壁のプロフェッショナルです。
非常に多くの塗料・プランをご用意されており、外壁診断士さんがお住まい一軒一軒に合ったプランを提案してくれます。

非常に多くの職人さんが在籍され、宣伝・広告にも力を入れておられるので、工事金額自体は決して安価ではありません
しかし、外壁をしっかり診断してほしい・質の良い塗装工事をしてほしいといった、金額より施工品質重視の方にはおすすめの塗装業者さんです。

株式会社 伊藤建装さんを利用した方の評判・口コミ

40代・女性・京都市左京区在住

職人さん達はゴミの片付けもきっちりされていて良かったと思います。
女性の職人さんがいらっしゃったので驚きました。
足場を組む時なども男性と変わらない力強さで仕事をこなされていたので感心してました。

40代・男性・京都市西京区在住

細かいところまで綺麗にして頂き、ありがとうございました。
工事中、台風が来た時には困りましたが、結果的に綺麗に仕上げてくださり満足です。

50代・男性・滋賀県大津市在住

見積もりから施工まで、こまかいこだわりを重視してくださりありがとうございました。
家が生まれ変わったように綺麗になり感謝しています。
丁寧な職人さん達にも感謝です。

京都で評判・口コミの良い外壁塗装業者ランキング

京都でのおすすめ優良外壁塗装業者
1位:株式会社ウェルビーホーム
京都で評判・口コミの良い外壁塗装業者ランキング|株式会社ウェルビーホーム
京都でのおすすめ優良外壁塗装業者
2位:株式会社 佐藤塗装店
京京都で評判・口コミの良い外壁塗装業者ランキング|株式会社 佐藤塗装店
京都でのおすすめ優良外壁塗装業者
3位:株式会社 伊藤建装
京都で評判・口コミの良い外壁塗装業者ランキング|株式会社 伊藤建装

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