diff --git a/wp-admin/js/customize-controls.js b/wp-admin/js/customize-controls.js
index d5f2e4e448..4410593a0b 100644
--- a/wp-admin/js/customize-controls.js
+++ b/wp-admin/js/customize-controls.js
@@ -3105,6 +3105,7 @@
 
 				// Create the iframe and inject the html content.
 				self.iframe = $( '<iframe />', { 'title': api.l10n.previewIframeTitle } ).appendTo( self.container );
+				self.iframe.attr( 'onmousewheel', '' ); // Workaround for Safari bug. See WP Trac #38149.
 
 				// Bind load event after the iframe has been added to the page;
 				// otherwise it will fire when injected into the DOM.
diff --git a/wp-admin/js/customize-controls.min.js b/wp-admin/js/customize-controls.min.js
index 7df0235037..693df23ac3 100644
--- a/wp-admin/js/customize-controls.min.js
+++ b/wp-admin/js/customize-controls.min.js
@@ -1,2 +1,2 @@
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this.onChangeActive(a,this.defaultActiveArguments)},activate:c.prototype.activate,deactivate:c.prototype.deactivate,_toggleActive:c.prototype._toggleActive,dropdownInit:function(){var a=this,b=this.container.find(".dropdown-status"),c=this.params,d=!1,e=function(a){"string"==typeof a&&c.statuses&&c.statuses[a]?b.html(c.statuses[a]).show():b.hide()};this.container.on("click keydown",".dropdown",function(b){f.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),d||a.container.toggleClass("open"),a.container.hasClass("open")&&a.container.parent().parent().find("li.library-selected").focus(),d=!0,setTimeout(function(){d=!1},400))}),this.setting.bind(e),e(this.setting())},renderContent:function(){var a,c=this;0!==b("#tmpl-"+c.templateSelector).length&&(a=wp.template(c.templateSelector),a&&c.container&&c.container.html(a(c.params)))}}),f.ColorControl=f.Control.extend({ready:function(){var a=this,b=this.container.find(".color-picker-hex");b.val(a.setting()).wpColorPicker({change:function(){a.setting.set(b.wpColorPicker("color"))},clear:function(){a.setting.set("")}}),this.setting.bind(function(a){b.val(a),b.wpColorPicker("color",a)})}}),f.MediaControl=f.Control.extend({ready:function(){function a(a){var d=b.Deferred();c.extended(f.UploadControl)?d.resolve():(a=parseInt(a,10),_.isNaN(a)||0>=a?(delete c.params.attachment,d.resolve()):c.params.attachment&&c.params.attachment.id===a&&d.resolve()),"pending"===d.state()&&wp.media.attachment(a).fetch().done(function(){c.params.attachment=this.attributes,d.resolve(),wp.customize.previewer.send(c.setting.id+"-attachment-data",this.attributes)}),d.done(function(){c.renderContent()})}var c=this;_.bindAll(c,"restoreDefault","removeFile","openFrame","select","pausePlayer"),c.container.on("click keydown",".upload-button",c.openFrame),c.container.on("click keydown",".upload-button",c.pausePlayer),c.container.on("click 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a,b=this.frame.state().get("selection").first().toJSON(),c=window._wpmejsSettings||{};this.params.attachment=b,this.setting(b.url),a=this.container.find("audio, video").get(0),a?this.player=new MediaElementPlayer(a,c):this.cleanupPlayer()},success:function(){},removerVisibility:function(){}}),f.ImageControl=f.UploadControl.extend({thumbnailSrc:function(){}}),f.BackgroundControl=f.UploadControl.extend({ready:function(){f.UploadControl.prototype.ready.apply(this,arguments)},select:function(){f.UploadControl.prototype.select.apply(this,arguments),wp.ajax.post("custom-background-add",{nonce:_wpCustomizeBackground.nonces.add,wp_customize:"on",theme:f.settings.theme.stylesheet,attachment_id:this.params.attachment.id})}}),f.CroppedImageControl=f.MediaControl.extend({openFrame:function(a){f.utils.isKeydownButNotEnterEvent(a)||(this.initFrame(),this.frame.setState("library").open())},initFrame:function(){var a=_wpMediaViewsL10n;this.frame=wp.media({button:{text:a.select,close:!1},states:[new wp.media.controller.Library({title:this.params.button_labels.frame_title,library:wp.media.query({type:"image"}),multiple:!1,date:!1,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)},onSelect:function(){var a=this.frame.state().get("selection").first().toJSON();this.params.width!==a.width||this.params.height!==a.height||this.params.flex_width||this.params.flex_height?this.frame.setState("cropper"):(this.setImageFromAttachment(a),this.frame.close())},onCropped:function(a){this.setImageFromAttachment(a)},calculateImageSelectOptions:function(a,b){var c,d,e,f=b.get("control"),g=!!parseInt(f.params.flex_width,10),h=!!parseInt(f.params.flex_height,10),i=a.get("width"),j=a.get("height"),k=parseInt(f.params.width,10),l=parseInt(f.params.height,10),m=k/l,n=k,o=l;return b.set("canSkipCrop",!f.mustBeCropped(g,h,k,l,i,j)),i/j>m?(l=j,k=l*m):(k=i,l=k/m),c=(i-k)/2,d=(j-l)/2,e={handles:!0,keys:!0,instance:!0,persistent:!0,imageWidth:i,imageHeight:j,minWidth:n>k?k:n,minHeight:o>l?l:o,x1:c,y1:d,x2:k+c,y2:l+d},h===!1&&g===!1&&(e.aspectRatio=k+":"+l),!0===h&&(delete e.minHeight,e.maxWidth=i),!0===g&&(delete e.minWidth,e.maxHeight=j),e},mustBeCropped:function(a,b,c,d,e,f){return!0===a&&!0===b?!1:!0===a&&d===f?!1:!0===b&&c===e?!1:c===e&&d===f?!1:!(c>=e)},onSkippedCrop:function(){var a=this.frame.state().get("selection").first().toJSON();this.setImageFromAttachment(a)},setImageFromAttachment:function(a){this.params.attachment=a,this.setting(a.id)}}),f.SiteIconControl=f.CroppedImageControl.extend({initFrame:function(){var a=_wpMediaViewsL10n;this.frame=wp.media({button:{text:a.select,close:!1},states:[new wp.media.controller.Library({title:this.params.button_labels.frame_title,library:wp.media.query({type:"image"}),multiple:!1,date:!1,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)},onSelect:function(){var a=this.frame.state().get("selection").first().toJSON(),b=this;this.params.width!==a.width||this.params.height!==a.height||this.params.flex_width||this.params.flex_height?this.frame.setState("cropper"):wp.ajax.post("crop-image",{nonce:a.nonces.edit,id:a.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(a){b.setImageFromAttachment(a),b.frame.close()}).fail(function(){b.frame.trigger("content:error:crop")})},setImageFromAttachment:function(a){var c,d=["site_icon-32","thumbnail","full"];_.each(d,function(b){c||_.isUndefined(a.sizes[b])||(c=a.sizes[b])}),this.params.attachment=a,this.setting(a.id),b('link[sizes="32x32"]').attr("href",c.url)},removeFile:function(a){f.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),this.params.attachment={},this.setting(""),this.renderContent(),b('link[rel="icon"]').attr("href",""))}}),f.HeaderControl=f.Control.extend({ready:function(){this.btnRemove=b("#customize-control-header_image .actions .remove"),this.btnNew=b("#customize-control-header_image .actions .new"),_.bindAll(this,"openMedia","removeImage"),this.btnNew.on("click",this.openMedia),this.btnRemove.on("click",this.removeImage),f.HeaderTool.currentHeader=this.getInitialHeaderImage(),new f.HeaderTool.CurrentView({model:f.HeaderTool.currentHeader,el:"#customize-control-header_image .current .container"}),new f.HeaderTool.ChoiceListView({collection:f.HeaderTool.UploadsList=new f.HeaderTool.ChoiceList,el:"#customize-control-header_image .choices .uploaded .list"}),new f.HeaderTool.ChoiceListView({collection:f.HeaderTool.DefaultsList=new f.HeaderTool.DefaultsList,el:"#customize-control-header_image .choices .default .list"}),f.HeaderTool.combinedList=f.HeaderTool.CombinedList=new f.HeaderTool.CombinedList([f.HeaderTool.UploadsList,f.HeaderTool.DefaultsList]),wp.media.controller.Cropper.prototype.defaults.doCropArgs.wp_customize="on",wp.media.controller.Cropper.prototype.defaults.doCropArgs.theme=f.settings.theme.stylesheet},getInitialHeaderImage:function(){if(!f.get().header_image||!f.get().header_image_data||_.contains(["remove-header","random-default-image","random-uploaded-image"],f.get().header_image))return new f.HeaderTool.ImageModel;var a=_.find(_wpCustomizeHeader.uploads,function(a){return a.attachment_id===f.get().header_image_data.attachment_id});return a||(a={url:f.get().header_image,thumbnail_url:f.get().header_image,attachment_id:f.get().header_image_data.attachment_id}),new f.HeaderTool.ImageModel({header:a,choice:a.url.split("/").pop()})},calculateImageSelectOptions:function(a,b){var c,d,e,g,h,i,j=parseInt(_wpCustomizeHeader.data.width,10),k=parseInt(_wpCustomizeHeader.data.height,10),l=!!parseInt(_wpCustomizeHeader.data["flex-width"],10),m=!!parseInt(_wpCustomizeHeader.data["flex-height"],10);return h=a.get("width"),g=a.get("height"),this.headerImage=new f.HeaderTool.ImageModel,this.headerImage.set({themeWidth:j,themeHeight:k,themeFlexWidth:l,themeFlexHeight:m,imageWidth:h,imageHeight:g}),b.set("canSkipCrop",!this.headerImage.shouldBeCropped()),c=j/k,d=h,e=g,d/e>c?(k=e,j=k*c):(j=d,k=j/c),i={handles:!0,keys:!0,instance:!0,persistent:!0,imageWidth:h,imageHeight:g,x1:0,y1:0,x2:j,y2:k},m===!1&&l===!1&&(i.aspectRatio=j+":"+k),m===!1&&(i.maxHeight=k),l===!1&&(i.maxWidth=j),i},openMedia:function(a){var b=_wpMediaViewsL10n;a.preventDefault(),this.frame=wp.media({button:{text:b.selectAndCrop,close:!1},states:[new wp.media.controller.Library({title:b.chooseImage,library:wp.media.query({type:"image"}),multiple:!1,date:!1,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()},onSelect:function(){this.frame.setState("cropper")},onCropped:function(a){var b=a.url,c=a.attachment_id,d=a.width,e=a.height;this.setImageFromURL(b,c,d,e)},onSkippedCrop:function(a){var b=a.get("url"),c=a.get("width"),d=a.get("height");this.setImageFromURL(b,a.id,c,d)},setImageFromURL:function(a,b,c,d){var e,g={};g.url=a,g.thumbnail_url=a,g.timestamp=_.now(),b&&(g.attachment_id=b),c&&(g.width=c),d&&(g.height=d),e=new f.HeaderTool.ImageModel({header:g,choice:a.split("/").pop()}),f.HeaderTool.UploadsList.add(e),f.HeaderTool.currentHeader.set(e.toJSON()),e.save(),e.importImage()},removeImage:function(){f.HeaderTool.currentHeader.trigger("hide"),f.HeaderTool.CombinedList.trigger("control:removeImage")}}),f.ThemeControl=f.Control.extend({touchDrag:!1,isRendered:!1,renderContent:function(){var a=this,b=arguments;f.section(a.section(),function(c){c.expanded()?(f.Control.prototype.renderContent.apply(a,b),a.isRendered=!0):c.expanded.bind(function(c){c&&!a.isRendered&&(f.Control.prototype.renderContent.apply(a,b),a.isRendered=!0)})})},ready:function(){var a=this;a.container.on("touchmove",".theme",function(){
-a.touchDrag=!0}),a.container.on("click keydown touchend",".theme",function(c){if(!f.utils.isKeydownButNotEnterEvent(c)){if(a.touchDrag===!0)return a.touchDrag=!1;if(!b(c.target).is(".theme-actions .button")){var d=b(this).data("previewUrl");b(".wp-full-overlay").addClass("customize-loading"),window.parent.location=d}}}),a.container.on("click keydown",".theme-actions .theme-details",function(b){f.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),f.section(a.section()).showDetails(a.params.theme))}),a.container.on("render-screenshot",function(){var a=b(this).find("img"),c=a.data("src");c&&a.attr("src",c)})},filter:function(a){var b=this,c=b.params.theme.name+" "+b.params.theme.description+" "+b.params.theme.tags+" "+b.params.theme.author;c=c.toLowerCase().replace("-"," "),-1!==c.search(a)?b.activate():b.deactivate()}}),f.defaultConstructor=f.Setting,f.control=new f.Values({defaultConstructor:f.Control}),f.section=new f.Values({defaultConstructor:f.Section}),f.panel=new f.Values({defaultConstructor:f.Panel}),f.PreviewFrame=f.Messenger.extend({sensitivity:2e3,initialize:function(a,c){var d=b.Deferred();d.promise(this),this.container=a.container,this.signature=a.signature,b.extend(a,{channel:f.PreviewFrame.uuid()}),f.Messenger.prototype.initialize.call(this,a,c),this.add("previewUrl",a.previewUrl),this.query=b.extend(a.query||{},{customize_messenger_channel:this.channel()}),this.run(d)},run:function(a){var c=this,d=!1,e=!1;this._ready&&this.unbind("ready",this._ready),this._ready=function(){e=!0,d&&a.resolveWith(c)},this.bind("ready",this._ready),this.bind("ready",function(a){if(this.container.addClass("iframe-ready"),a){var b={panel:a.activePanels,section:a.activeSections,control:a.activeControls};_(b).each(function(a,b){f[b].each(function(c,d){var e=_.isUndefined(f.settings[b+"s"][d]);e&&_.isUndefined(a[d])||(a[d]?c.activate():c.deactivate())})}),a.settingValidities&&f._handleSettingValidities({settingValidities:a.settingValidities,focusInvalidControl:!1})}}),this.request=b.ajax(this.previewUrl(),{type:"POST",data:this.query,xhrFields:{withCredentials:!0}}),this.request.fail(function(){a.rejectWith(c,["request failure"])}),this.request.done(function(g){var h,i=c.request.getResponseHeader("Location"),j=c.signature;return i&&i!==c.previewUrl()?void a.rejectWith(c,["redirect",i]):"0"===g?void c.login(a):"-1"===g?void a.rejectWith(c,["cheatin"]):(h=g.lastIndexOf(j),-1===h||h<g.lastIndexOf("</html>")?void a.rejectWith(c,["unsigned"]):(g=g.slice(0,h)+g.slice(h+j.length),c.iframe=b("<iframe />",{title:f.l10n.previewIframeTitle}).appendTo(c.container),c.iframe.one("load",function(){d=!0,e?a.resolveWith(c):setTimeout(function(){a.rejectWith(c,["ready 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b,c;b=f.settings.documentTitleTmpl,c=b.replace("%s",a),document.title=c,f.trigger("title",c)},f.Previewer=f.Messenger.extend({refreshBuffer:250,initialize:function(a,c){var d=this,e=/^https?/;b.extend(this,c||{}),this.deferred={active:b.Deferred()},this.refresh=function(a){var b,c=a.refresh,d=function(){b=null,c.call(a)};return function(){if("number"!=typeof b){if(!a.loading)return d();a.abort()}clearTimeout(b),b=setTimeout(d,a.refreshBuffer)}}(this),this.container=f.ensure(a.container),this.allowedUrls=a.allowedUrls,this.signature=a.signature,a.url=window.location.href,f.Messenger.prototype.initialize.call(this,a),this.add("scheme",this.origin()).link(this.origin).setter(function(a){var b=a.match(e);return b?b[0]:""}),this.add("previewUrl",a.previewUrl).setter(function(a){var c,f;return f=document.createElement("a"),f.href=a,/\/wp-(admin|includes|content)(\/|$)/.test(f.pathname)?null:(b.each([a.replace(e,d.scheme()),a],function(a,e){return b.each(d.allowedUrls,function(a,b){var d;return b=b.replace(/\/+$/,""),d=e.replace(b,""),0===e.indexOf(b)&&/^([/#?]|$)/.test(d)?(c=e,!1):void 0}),c?!1:void 0}),c?c:null)}),this.previewUrl.bind(this.refresh),this.scroll=0,this.bind("scroll",function(a){this.scroll=a}),this.bind("url",this.previewUrl),this.bind("documentTitle",function(a){f.setDocumentTitle(a)})},query:function(){},abort:function(){this.loading&&(this.loading.destroy(),delete this.loading)},refresh:function(){var a=this;this.send("loading-initiated"),this.abort(),this.loading=new f.PreviewFrame({url:this.url(),previewUrl:this.previewUrl(),query:this.query()||{},container:this.container,signature:this.signature}),this.loading.done(function(){this.bind("synced",function(){a.preview&&a.preview.destroy(),a.preview=this,delete 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e._login}),b.done(function(){a.resolve()}),b.fail(function(){e.cheatin(),a.reject()})}),this._login)},cheatin:function(){b(document.body).empty().addClass("cheatin").append("<h1>"+f.l10n.cheatin+"</h1><p>"+f.l10n.notAllowed+"</p>")},refreshNonces:function(){var a,c=b.Deferred();return c.promise(),a=wp.ajax.post("customize_refresh_nonces",{wp_customize:"on",theme:f.settings.theme.stylesheet}),a.done(function(a){f.trigger("nonce-refresh",a),c.resolve()}),a.fail(function(){c.reject()}),c}}),f.settingConstructor={},f.controlConstructor={color:f.ColorControl,media:f.MediaControl,upload:f.UploadControl,image:f.ImageControl,cropped_image:f.CroppedImageControl,site_icon:f.SiteIconControl,header:f.HeaderControl,background:f.BackgroundControl,theme:f.ThemeControl},f.panelConstructor={},f.sectionConstructor={themes:f.ThemesSection},f._handleSettingValidities=function(a){var b,c=[],d=!1;_.each(a.settingValidities,function(a,b){var d=f(b);d&&(_.isObject(a)&&_.each(a,function(a,b){var e,g,h=!1;e=new f.Notification(b,_.extend({fromServer:!0},a)),g=d.notifications(e.code),g&&(h=e.type!==g.type||e.message!==g.message||!_.isEqual(e.data,g.data)),h&&d.notifications.remove(b),d.notifications.has(e.code)||d.notifications.add(b,e),c.push(d.id)}),d.notifications.each(function(b){"error"!==b.type||!0!==a&&a[b.code]||d.notifications.remove(b.code)}))}),a.focusInvalidControl&&(b=f.findControlsForSettings(c),_(_.values(b)).find(function(a){return _(a).find(function(a){var b=a.section()&&f.section.has(a.section())&&f.section(a.section()).expanded();return b&&a.expanded&&(b=a.expanded()),b&&(a.focus(),d=!0),d})}),d||_.isEmpty(b)||_.values(b)[0][0].focus())},f.findControlsForSettings=function(a){var b,c={};return _.each(_.unique(a),function(a){var d=f(a);d&&(b=d.findControls(),b&&b.length>0&&(c[a]=b))}),c},f.reflowPaneContents=_.bind(function(){var a,c,d,e=[],g=!1;document.activeElement&&(c=b(document.activeElement)),f.panel.each(function(b){var 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d.done(function(a){f.each(function(a){k[a.id]||(a._dirty=!1)}),f.previewer.send("saved",a),a.setting_validities&&f._handleSettingValidities({settingValidities:a.setting_validities,focusInvalidControl:!0}),f.trigger("saved",a),_.isEmpty(k)||f.state("saved").set(!1)})):(_.values(g)[0][0].focus(),c.removeClass("saving"),void f.unbind("change",a))},0===j()?e():(d=function(){0===j()&&(f.state.unbind("change",d),e())},f.state.bind("change",d))}}),f.previewer.bind("nonce",function(a){b.extend(this.nonce,a)}),f.bind("nonce-refresh",function(a){b.extend(f.settings.nonce,a),b.extend(f.previewer.nonce,a),f.previewer.send("nonce-refresh",a)}),b.each(f.settings.settings,function(a,b){var c,d=f.settingConstructor[b.type]||f.Setting;c=new d(a,b.value,{transport:b.transport,previewer:f.previewer,dirty:!!b.dirty}),f.add(a,c)}),b.each(f.settings.panels,function(a,b){var c,d=f.panelConstructor[b.type]||f.Panel;c=new d(a,{params:b}),f.panel.add(a,c)}),b.each(f.settings.sections,function(a,b){var c,d=f.sectionConstructor[b.type]||f.Section;c=new d(a,{params:b}),f.section.add(a,c)}),b.each(f.settings.controls,function(a,b){var c,d=f.controlConstructor[b.type]||f.Control;c=new d(a,{params:b,previewer:f.previewer}),f.control.add(a,c)}),_.each(["panel","section","control"],function(a){var b=f.settings.autofocus[a];b&&f[a](b,function(a){a.deferred.embedded.done(function(){f.previewer.deferred.active.done(function(){a.focus()})})})}),f.bind("ready",f.reflowPaneContents),b([f.panel,f.section,f.control]).each(function(a,b){var c=_.debounce(f.reflowPaneContents,100);b.bind("add",c),b.bind("change",c),b.bind("remove",c)}),f.previewer.previewUrl()?f.previewer.refresh():f.previewer.previewUrl(f.settings.url.home),function(){var a=new f.Values,b=a.create("saved"),c=a.create("activated"),d=a.create("processing"),e=a.create("paneVisible");a.bind("change",function(){c()?b()?(h.val(f.l10n.saved).prop("disabled",!0),g.find(".screen-reader-text").text(f.l10n.close)):(h.val(f.l10n.save).prop("disabled",!1),g.find(".screen-reader-text").text(f.l10n.cancel)):(h.val(f.l10n.activate).prop("disabled",!1),g.find(".screen-reader-text").text(f.l10n.cancel))}),b(!0),c(f.settings.theme.active),d(0),e(!0),f.bind("change",function(){a("saved").set(!1)}),f.bind("saved",function(){a("saved").set(!0),a("activated").set(!0)}),c.bind(function(a){a&&f.trigger("activated")}),f.state=a}(),h.click(function(a){f.previewer.save(),a.preventDefault()}).keydown(function(a){9!==a.which&&(13===a.which&&f.previewer.save(),a.preventDefault())}),g.keydown(function(a){9!==a.which&&(13===a.which&&this.click(),a.preventDefault())}),b(".collapse-sidebar").on("click",function(){f.state("paneVisible").set(!f.state("paneVisible").get())}),f.state("paneVisible").bind(function(a){d.toggleClass("expanded",a),d.toggleClass("collapsed",!a),a?b(".collapse-sidebar").attr({"aria-expanded":"true","aria-label":f.l10n.collapseSidebar}):b(".collapse-sidebar").attr({"aria-expanded":"false","aria-label":f.l10n.expandSidebar})}),b("body").on("keydown",function(a){var b,c=[],d=[],e=[];27===a.which&&(f.control.each(function(a){a.expanded&&a.expanded()&&_.isFunction(a.collapse)&&c.push(a)}),f.section.each(function(a){a.expanded()&&d.push(a)}),f.panel.each(function(a){a.expanded()&&e.push(a)}),c.length>0&&0===d.length&&(c.length=0),b=c[0]||d[0]||e[0],b&&(b.collapse(),a.preventDefault()))}),b(".customize-controls-preview-toggle").on("click",function(){d.toggleClass("preview-only")}),f.previewedDevice=new f.Value,f.bind("ready",function(){_.find(f.settings.previewableDevices,function(a,b){return!0===a["default"]?(f.previewedDevice.set(b),!0):void 0})}),i.find(".devices button").on("click",function(a){f.previewedDevice.set(b(a.currentTarget).data("device"))}),f.previewedDevice.bind(function(a){var c=b(".wp-full-overlay"),d="";i.find(".devices button").removeClass("active").attr("aria-pressed",!1),i.find(".devices .preview-"+a).addClass("active").attr("aria-pressed",!0),b.each(f.settings.previewableDevices,function(a){d+=" preview-"+a}),c.removeClass(d).addClass("preview-"+a)}),e.length&&f("blogname",function(a){var c=function(){e.text(b.trim(a())||f.l10n.untitledBlogName)};a.bind(c),c()}),a=new f.Messenger({url:f.settings.url.parent,channel:"loader"}),a.bind("back",function(){g.on("click.customize-controls-close",function(b){b.preventDefault(),a.send("close")})}),b(window).on("beforeunload",function(){return f.state("saved")()?void 0:(setTimeout(function(){d.removeClass("customize-loading")},1),f.l10n.saveAlert)}),b.each(["saved","change"],function(b,c){f.bind(c,function(){a.send(c)})}),f.bind("title",function(b){a.send("title",b)}),a.send("ready"),b.each({background_image:{controls:["background_repeat","background_position_x","background_attachment"],callback:function(a){return!!a}},show_on_front:{controls:["page_on_front","page_for_posts"],callback:function(a){return"page"===a}},header_textcolor:{controls:["header_textcolor"],callback:function(a){return"blank"!==a}}},function(a,c){f(a,function(a){b.each(c.controls,function(b,d){f.control(d,function(b){var d=function(a){b.container.toggle(c.callback(a))};d(a.get()),a.bind(d)})})})}),f.control("display_header_text",function(a){var b="";a.elements[0].unsync(f("header_textcolor")),a.element=new f.Element(a.container.find("input")),a.element.set("blank"!==a.setting()),a.element.bind(function(c){c||(b=f("header_textcolor").get()),a.setting.set(c?b:"blank")}),a.setting.bind(function(b){a.element.set("blank"!==b)})}),f("show_on_front","page_on_front",function(a,b){var c=function(){"page"===a()&&parseInt(b(),10)>0&&f.previewer.previewUrl.set(f.settings.url.home)};a.bind(c),b.bind(c)}),f("page_for_posts",function(a){a.bind(function(a){a=parseInt(a,10),a>0&&f.previewer.previewUrl.set(f.settings.url.home+"?page_id="+a)})}),f.previewer.bind("selective-refresh-setting-validities",function(a){f._handleSettingValidities({settingValidities:a,focusInvalidControl:!1})}),f.previewer.bind("focus-control-for-setting",function(a){var b;f.control.each(function(c){var d=_.pluck(c.settings,"id");-1!==_.indexOf(d,a)&&(b=c)}),b&&b.focus()}),f.previewer.bind("refresh",function(){f.previewer.refresh()}),f.trigger("ready")}})}(wp,jQuery);
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index afa91bf48c..b8c173043e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38741';
+$wp_version = '4.7-alpha-38742';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.