+ /*
+ * Track the dirtiness state (whether the drafted changes have been published)
+ * of the Customizer in the iframe. This is used to decide whether to display
+ * an AYS alert if the user tries to close the window before saving changes.
+ */
+ this.saved = new api.Value( true );
+
+ this.iframe = $( '<iframe />', { 'src': src, 'title': Loader.settings.l10n.mainIframeTitle } ).appendTo( this.element );