diff --git a/wp-admin/customize.php b/wp-admin/customize.php
index 9be60c7e74..e3ea406f28 100644
--- a/wp-admin/customize.php
+++ b/wp-admin/customize.php
@@ -175,7 +175,9 @@ do_action( 'customize_controls_print_scripts' );
 	<div id="customize-preview" class="wp-full-overlay-main"></div>
 	<?php
 
-	// Render control templates.
+	// Render Panel, Section, and Control templates.
+	$wp_customize->render_panel_templates();
+	$wp_customize->render_section_templates();
 	$wp_customize->render_control_templates();
 
 	/**
@@ -259,28 +261,38 @@ do_action( 'customize_controls_print_scripts' );
 
 	// Prepare Customize Setting objects to pass to JavaScript.
 	foreach ( $wp_customize->settings() as $id => $setting ) {
-		$settings['settings'][ $id ] = array(
-			'value'     => $setting->js_value(),
-			'transport' => $setting->transport,
-			'dirty'     => $setting->dirty,
-		);
+		if ( $setting->check_capabilities() ) {
+			$settings['settings'][ $id ] = array(
+				'value'     => $setting->js_value(),
+				'transport' => $setting->transport,
+				'dirty'     => $setting->dirty,
+			);
+		}
 	}
 
 	// Prepare Customize Control objects to pass to JavaScript.
 	foreach ( $wp_customize->controls() as $id => $control ) {
-		$settings['controls'][ $id ] = $control->json();
+		if ( $control->check_capabilities() ) {
+			$settings['controls'][ $id ] = $control->json();
+		}
 	}
 
 	// Prepare Customize Section objects to pass to JavaScript.
 	foreach ( $wp_customize->sections() as $id => $section ) {
-		$settings['sections'][ $id ] = $section->json();
+		if ( $section->check_capabilities() ) {
+			$settings['sections'][ $id ] = $section->json();
+		}
 	}
 
 	// Prepare Customize Panel objects to pass to JavaScript.
-	foreach ( $wp_customize->panels() as $id => $panel ) {
-		$settings['panels'][ $id ] = $panel->json();
-		foreach ( $panel->sections as $section_id => $section ) {
-			$settings['sections'][ $section_id ] = $section->json();
+	foreach ( $wp_customize->panels() as $panel_id => $panel ) {
+		if ( $panel->check_capabilities() ) {
+			$settings['panels'][ $panel_id ] = $panel->json();
+			foreach ( $panel->sections as $section_id => $section ) {
+				if ( $section->check_capabilities() ) {
+					$settings['sections'][ $section_id ] = $section->json();
+				}
+			}
 		}
 	}
 
diff --git a/wp-admin/js/customize-controls.js b/wp-admin/js/customize-controls.js
index 7ed309572a..2d7f3bad4a 100644
--- a/wp-admin/js/customize-controls.js
+++ b/wp-admin/js/customize-controls.js
@@ -156,6 +156,7 @@
 	Container = api.Class.extend({
 		defaultActiveArguments: { duration: 'fast', completeCallback: $.noop },
 		defaultExpandedArguments: { duration: 'fast', completeCallback: $.noop },
+		containerType: 'container',
 
 		/**
 		 * @since 4.1.0
@@ -168,7 +169,11 @@
 			container.id = id;
 			container.params = {};
 			$.extend( container, options || {} );
+			container.templateSelector = 'customize-' + container.containerType + '-' + container.params.type;
 			container.container = $( container.params.content );
+			if ( 0 === container.container.length ) {
+				container.container = $( container.getContainer() );
+			}
 
 			container.deferred = {
 				embedded: new $.Deferred()
@@ -191,7 +196,9 @@
 				container.onChangeExpanded( expanded, args );
 			});
 
-			container.attachEvents();
+			container.deferred.embedded.done( function () {
+				container.attachEvents();
+			});
 
 			api.utils.bubbleChildValueChanges( container, [ 'priority', 'active' ] );
 
@@ -366,7 +373,26 @@
 		 * Bring the container into view and then expand this and bring it into view
 		 * @param {Object} [params]
 		 */
-		focus: focus
+		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 );
+				if ( template && container.container ) {
+					return $.trim( template( container.params ) );
+				}
+			}
+
+			return '<li></li>';
+		}
 	});
 
 	/**
@@ -376,6 +402,7 @@
 	 * @augments wp.customize.Class
 	 */
 	api.Section = Container.extend({
+		containerType: 'section',
 
 		/**
 		 * @since 4.1.0
@@ -977,6 +1004,8 @@
 	 * @augments wp.customize.Class
 	 */
 	api.Panel = Container.extend({
+		containerType: 'panel',
+
 		/**
 		 * @since 4.1.0
 		 *
@@ -1003,6 +1032,7 @@
 
 			if ( ! panel.container.parent().is( parentContainer ) ) {
 				parentContainer.append( panel.container );
+				panel.renderContent();
 			}
 			panel.deferred.embedded.resolve();
 		},
@@ -1045,6 +1075,7 @@
 				}
 				event.preventDefault(); // Keep this AFTER the key filter above
 
+				meta = panel.container.find( '.panel-meta' );
 				if ( meta.hasClass( 'cannot-expand' ) ) {
 					return;
 				}
@@ -1169,6 +1200,26 @@
 				panelTitle.focus();
 				container.scrollTop( 0 );
 			}
+		},
+
+		/**
+		 * 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' );
+				if ( template && panel.container ) {
+					panel.container.find( '.accordion-sub-container' ).html( template( panel.params ) );
+				}
+			}
 		}
 	});
 
diff --git a/wp-admin/js/customize-controls.min.js b/wp-admin/js/customize-controls.min.js
index b04966d579..2c0c3ecaab 100644
--- a/wp-admin/js/customize-controls.min.js
+++ b/wp-admin/js/customize-controls.min.js
@@ -1,2 +1,2 @@
-!function(a,b){var c,d,e=wp.customize;e.Setting=e.Value.extend({initialize:function(a,b,c){e.Value.prototype.initialize.call(this,b,c),this.id=a,this.transport=this.transport||"refresh",this._dirty=c.dirty||!1,this.bind(this.preview)},preview:function(){switch(this.transport){case"refresh":return this.previewer.refresh();case"postMessage":return this.previewer.send("setting",[this.id,this()])}}}),e.utils={},e.utils.bubbleChildValueChanges=function(a,c){b.each(c,function(b,c){a[c].bind(function(b,c){a.parent&&b!==c&&a.parent.trigger("change",a)})})},d=function(a){var b,c,d;b=this,a=a||{},d=function(){var a;a=b.extended(e.Panel)&&b.expanded()?b.container.find(".control-panel-content:first"):b.container,a.find(":focusable:first").focus(),a[0].scrollIntoView(!0)},a.completeCallback?(c=a.completeCallback,a.completeCallback=function(){d(),c()}):a.completeCallback=d,b.expand?b.expand(a):a.completeCallback()},e.utils.prioritySort=function(a,b){return a.priority()===b.priority()&&"number"==typeof a.params.instanceNumber&&"number"==typeof b.params.instanceNumber?a.params.instanceNumber-b.params.instanceNumber:a.priority()-b.priority()},e.utils.isKeydownButNotEnterEvent=function(a){return"keydown"===a.type&&13!==a.which},e.utils.areElementListsEqual=function(a,c){var d=a.length===c.length&&-1===_.indexOf(_.map(_.zip(a,c),function(a){return b(a[0]).is(a[1])}),!1);return d},c=e.Class.extend({defaultActiveArguments:{duration:"fast",completeCallback:b.noop},defaultExpandedArguments:{duration:"fast",completeCallback:b.noop},initialize:function(a,c){var d=this;d.id=a,d.params={},b.extend(d,c||{}),d.container=b(d.params.content),d.deferred={embedded:new b.Deferred},d.priority=new e.Value,d.active=new e.Value,d.activeArgumentsQueue=[],d.expanded=new e.Value,d.expandedArgumentsQueue=[],d.active.bind(function(a){var c=d.activeArgumentsQueue.shift();c=b.extend({},d.defaultActiveArguments,c),a=a&&d.isContextuallyActive(),d.onChangeActive(a,c)}),d.expanded.bind(function(a){var c=d.expandedArgumentsQueue.shift();c=b.extend({},d.defaultExpandedArguments,c),d.onChangeExpanded(a,c)}),d.attachEvents(),e.utils.bubbleChildValueChanges(d,["priority","active"]),d.priority.set(isNaN(d.params.priority)?100:d.params.priority),d.active.set(d.params.active),d.expanded.set(!1)},ready:function(){},_children:function(a,b){var c=this,d=[];return e[b].each(function(b){b[a].get()===c.id&&d.push(b)}),d.sort(e.utils.prioritySort),d},isContextuallyActive:function(){throw new Error("Container.isContextuallyActive() must be overridden in a subclass.")},onChangeActive:function(a,c){var d="resolved"===e.previewer.deferred.active.state()?c.duration:0;b.contains(document,this.container)?a?this.container.stop(!0,!0).slideDown(d,c.completeCallback):this.container.stop(!0,!0).slideUp(d,c.completeCallback):(this.container.toggle(a),c.completeCallback&&c.completeCallback())},_toggleActive:function(a,b){var c=this;return b=b||{},a&&this.active.get()||!a&&!this.active.get()?(b.unchanged=!0,c.onChangeActive(c.active.get(),b),!1):(b.unchanged=!1,this.activeArgumentsQueue.push(b),this.active.set(a),!0)},activate:function(a){return this._toggleActive(!0,a)},deactivate:function(a){return this._toggleActive(!1,a)},onChangeExpanded:function(){throw new Error("Must override with subclass.")},_toggleExpanded:function(a,b){var c=this;b=b||{};var d=this,e=b.completeCallback;return b.completeCallback=function(){e&&e.apply(d,arguments),d.container.trigger(a?"expanded":"collapsed")},a&&this.expanded.get()||!a&&!this.expanded.get()?(b.unchanged=!0,c.onChangeExpanded(c.expanded.get(),b),!1):(b.unchanged=!1,this.expandedArgumentsQueue.push(b),this.expanded.set(a),!0)},expand:function(a){return this._toggleExpanded(!0,a)},collapse:function(a){return this._toggleExpanded(!1,a)},focus:d}),e.Section=c.extend({initialize:function(a,d){var f=this;c.prototype.initialize.call(f,a,d),f.id=a,f.panel=new e.Value,f.panel.bind(function(a){b(f.container).toggleClass("control-subsection",!!a)}),f.panel.set(f.params.panel||""),e.utils.bubbleChildValueChanges(f,["panel"]),f.embed(),f.deferred.embedded.done(function(){f.ready()})},embed:function(){var a,c=this;a=function(a){var d;a?e.panel(a,function(a){a.deferred.embedded.done(function(){d=a.container.find("ul:first"),c.container.parent().is(d)||d.append(c.container),c.deferred.embedded.resolve()})}):(d=b("#customize-theme-controls").children("ul"),c.container.parent().is(d)||d.append(c.container),c.deferred.embedded.resolve())},c.panel.bind(a),a(c.panel.get())},attachEvents:function(){var a=this,b=a.container.find(".customize-section-back"),c=a.container.find(".accordion-section-title").first();a.container.find(".accordion-section-title, .customize-section-back").on("click keydown",function(d){e.utils.isKeydownButNotEnterEvent(d)||(d.preventDefault(),a.expanded()?(a.collapse(),b.attr("tabindex","-1"),c.attr("tabindex","0"),c.focus()):(a.expand(),c.attr("tabindex","-1"),b.attr("tabindex","0"),b.focus()))})},isContextuallyActive:function(){var a=this,b=a.controls(),c=0;return _(b).each(function(a){a.active()&&(c+=1)}),0!==c},controls:function(){return this._children("section","control")},onChangeExpanded:function(a,b){var c,d,f,g=this,h=g.container.closest(".wp-full-overlay-sidebar-content"),i=g.container.find(".accordion-section-content"),j=g.container.closest(".wp-full-overlay");a&&!g.container.hasClass("open")?(b.unchanged?f=b.completeCallback:(h.scrollTop(0),f=function(){g.container.addClass("open"),j.addClass("section-open"),c=i.offset().top,d=h.scrollTop(),i.css("margin-top",45-c-d)}),b.allowMultiple||e.section.each(function(a){a!==g&&a.collapse({duration:b.duration})}),g.panel()?e.panel(g.panel()).expand({duration:b.duration,completeCallback:f}):f()):g.container.hasClass("open")&&(g.container.removeClass("open"),j.removeClass("section-open"),i.css("margin-top","inherit"),h.scrollTop(0),g.container.find(".accordion-section-title").focus())}}),e.ThemesSection=e.Section.extend({currentTheme:"",overlay:"",template:"",screenshotQueue:null,$window:b(window),initialize:function(){return this.$customizeSidebar=b(".wp-full-overlay-sidebar-content:first"),e.Section.prototype.initialize.apply(this,arguments)},ready:function(){var a=this;a.overlay=a.container.find(".theme-overlay"),a.template=wp.template("customize-themes-details-view"),b("body").on("keyup",function(b){a.overlay.find(".theme-wrap").is(":visible")&&(39===b.keyCode&&a.nextTheme(),37===b.keyCode&&a.previousTheme(),27===b.keyCode&&a.closeDetails())}),_.bindAll(this,"renderScreenshots")},isContextuallyActive:function(){return this.active()},attachEvents:function(){var a=this;a.container.find(".change-theme, .customize-theme").on("click keydown",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.expanded()?a.collapse():a.expand())}),a.container.on("click keydown",".left",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.previousTheme())}),a.container.on("click keydown",".right",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.nextTheme())}),a.container.on("click keydown",".theme-backdrop, .close",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.closeDetails())});var b=_.throttle(_.bind(a.renderScreenshots,this),100);a.container.on("input","#themes-filter",function(c){var d,e=c.currentTarget.value.toLowerCase().trim().replace("-"," "),f=a.controls();_.each(f,function(a){a.filter(e)}),b(),d=a.container.find("li.customize-control:visible").length,a.container.find(".theme-count").text(d)}),e.bind("ready",function(){_.each(a.controls().slice(0,3),function(a){var b,c=a.params.theme.screenshot[0];c&&(b=new Image,b.src=c)})})},onChangeExpanded:function(a,c){if(c.unchanged)return void(c.completeCallback&&c.completeCallback());var d,f,g=this,h=g.container.closest(".accordion-section"),i=h.closest(".wp-full-overlay"),j=h.closest(".wp-full-overlay-sidebar-content"),k=j.find(".open"),l=h.find(".customize-theme"),m=h.find(".change-theme"),n=h.find(".control-panel-content");a?(e.section.each(function(a){a!==g&&a.collapse({duration:c.duration})}),e.panel.each(function(a){a.collapse({duration:0})}),n.show(0,function(){d=n.offset().top,f=j.scrollTop(),n.css("margin-top",b("#customize-header-actions").height()-d-f),h.addClass("current-panel"),i.addClass("in-themes-panel"),j.scrollTop(0),_.delay(g.renderScreenshots,10),g.$customizeSidebar.on("scroll.customize-themes-section",_.throttle(g.renderScreenshots,300)),c.completeCallback&&c.completeCallback()}),l.focus()):(k.removeClass("open"),h.removeClass("current-panel"),i.removeClass("in-themes-panel"),g.$customizeSidebar.off("scroll.customize-themes-section"),n.delay(180).hide(0,function(){n.css("margin-top","inherit"),c.completeCallback&&c.completeCallback()}),l.attr("tabindex","0"),m.focus(),j.scrollTop(0))},renderScreenshots:function(){var a=this;null===a.screenshotQueue&&(a.screenshotQueue=a.controls()),a.screenshotQueue.length&&(a.screenshotQueue=_.filter(a.screenshotQueue,function(b){var c=b.container.find(".theme-screenshot"),d=c.find("img");if(!d.length)return!1;if(d.is(":hidden"))return!0;var e=a.$window.scrollTop(),f=e+a.$window.height(),g=d.offset().top,h=c.height(),i=g+h,j=3*h,k=i>=e-j&&f+j>=g;return k&&b.container.trigger("render-screenshot"),!k}))},nextTheme:function(){var a=this;a.getNextTheme()&&a.showDetails(a.getNextTheme(),function(){a.overlay.find(".right").focus()})},getNextTheme:function(){var a,b;return a=e.control("theme_"+this.currentTheme),b=a.container.next("li.customize-control-theme"),b.length?(b=b[0].id.replace("customize-control-",""),a=e.control(b),a.params.theme):!1},previousTheme:function(){var a=this;a.getPreviousTheme()&&a.showDetails(a.getPreviousTheme(),function(){a.overlay.find(".left").focus()})},getPreviousTheme:function(){var a,b;return a=e.control("theme_"+this.currentTheme),b=a.container.prev("li.customize-control-theme"),b.length?(b=b[0].id.replace("customize-control-",""),a=e.control(b),a.params.theme):!1},updateLimits:function(){this.getNextTheme()||this.overlay.find(".right").addClass("disabled"),this.getPreviousTheme()||this.overlay.find(".left").addClass("disabled")},showDetails:function(a,c){var d=this;c=c||function(){},d.currentTheme=a.id,d.overlay.html(d.template(a)).fadeIn("fast").focus(),b("body").addClass("modal-open"),d.containFocus(d.overlay),d.updateLimits(),c()},closeDetails:function(){b("body").removeClass("modal-open"),this.overlay.fadeOut("fast"),e.control("theme_"+this.currentTheme).focus()},containFocus:function(a){var c;a.on("keydown",function(d){return 9===d.keyCode?(c=b(":tabbable",a),c.last()[0]!==d.target||d.shiftKey?c.first()[0]===d.target&&d.shiftKey?(c.last().focus(),!1):void 0:(c.first().focus(),!1)):void 0})}}),e.Panel=c.extend({initialize:function(a,b){var d=this;c.prototype.initialize.call(d,a,b),d.embed(),d.deferred.embedded.done(function(){d.ready()})},embed:function(){var a=this,c=b("#customize-theme-controls > ul");a.container.parent().is(c)||c.append(a.container),a.deferred.embedded.resolve()},attachEvents:function(){var a,c=this;c.container.find(".accordion-section-title").on("click keydown",function(a){e.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),c.expanded()||c.expand())}),c.container.find(".customize-panel-back").on("click keydown",function(a){e.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),c.expanded()&&c.collapse())}),a=c.container.find(".panel-meta:first"),a.find("> .accordion-section-title .customize-help-toggle").on("click keydown",function(d){if(!e.utils.isKeydownButNotEnterEvent(d)&&(d.preventDefault(),!a.hasClass("cannot-expand"))){var f=a.find(".customize-panel-description:first");a.hasClass("open")?(a.toggleClass("open"),f.slideUp(c.defaultExpandedArguments.duration),b(this).attr("aria-expanded",!1)):(f.slideDown(c.defaultExpandedArguments.duration),a.toggleClass("open"),b(this).attr("aria-expanded",!0))}})},sections:function(){return this._children("panel","section")},isContextuallyActive:function(){var a=this,b=a.sections(),c=0;return _(b).each(function(a){a.active()&&a.isContextuallyActive()&&(c+=1)}),0!==c},onChangeExpanded:function(a,c){if(c.unchanged)return void(c.completeCallback&&c.completeCallback());var d,f,g=this,h=g.container.closest(".accordion-section"),i=h.closest(".wp-full-overlay"),j=h.closest(".wp-full-overlay-sidebar-content"),k=j.find(".open"),l=i.find("#customize-theme-controls > ul > .accordion-section > .accordion-section-title"),m=h.find(".customize-panel-back"),n=h.find(".accordion-section-title").first(),o=h.find(".control-panel-content");a?(e.section.each(function(a){a.panel()||a.collapse({duration:0})}),e.panel.each(function(a){g!==a&&a.collapse({duration:0})}),o.show(0,function(){o.parent().show(),d=o.offset().top,f=j.scrollTop(),o.css("margin-top",b("#customize-header-actions").height()-d-f),h.addClass("current-panel"),i.addClass("in-sub-panel"),j.scrollTop(0),c.completeCallback&&c.completeCallback()}),l.attr("tabindex","-1"),m.attr("tabindex","0"),m.focus()):(k.removeClass("open"),h.removeClass("current-panel"),i.removeClass("in-sub-panel"),o.delay(180).hide(0,function(){o.css("margin-top","inherit"),c.completeCallback&&c.completeCallback()}),l.attr("tabindex","0"),m.attr("tabindex","-1"),n.focus(),j.scrollTop(0))}}),e.Control=e.Class.extend({defaultActiveArguments:{duration:"fast",completeCallback:b.noop},initialize:function(a,c){var d,f,g,h=this;h.params={},b.extend(h,c||{}),h.id=a,h.selector="#customize-control-"+a.replace(/\]/g,"").replace(/\[/g,"-"),h.templateSelector="customize-control-"+h.params.type+"-content",h.container=b(h.params.content?h.params.content:h.selector),h.deferred={embedded:new b.Deferred},h.section=new e.Value,h.priority=new e.Value,h.active=new e.Value,h.activeArgumentsQueue=[],h.elements=[],d=h.container.find("[data-customize-setting-link]"),f={},d.each(function(){var a,c=b(this);if(c.is(":radio")){if(a=c.prop("name"),f[a])return;f[a]=!0,c=d.filter('[name="'+a+'"]')}e(c.data("customizeSettingLink"),function(a){var b=new e.Element(c);h.elements.push(b),b.sync(a),b.set(a())})}),h.active.bind(function(a){var c=h.activeArgumentsQueue.shift();c=b.extend({},h.defaultActiveArguments,c),h.onChangeActive(a,c)}),h.section.set(h.params.section),h.priority.set(isNaN(h.params.priority)?10:h.params.priority),h.active.set(h.params.active),e.utils.bubbleChildValueChanges(h,["section","priority","active"]),g=b.map(h.params.settings,function(a){return a}),e.apply(e,g.concat(function(){var a;h.settings={};for(a in h.params.settings)h.settings[a]=e(h.params.settings[a]);h.setting=h.settings["default"]||null,h.embed()})),h.deferred.embedded.done(function(){h.ready()})},embed:function(){var a,b=this;a=function(a){var c;a&&e.section(a,function(a){a.deferred.embedded.done(function(){c=a.container.find("ul:first"),b.container.parent().is(c)||(c.append(b.container),b.renderContent()),b.deferred.embedded.resolve()})})},b.section.bind(a),a(b.section.get())},ready:function(){},expand:function(a){e.section(this.section()).expand(a)},focus:d,onChangeActive:function(a,c){b.contains(document,this.container)?a?this.container.slideDown(c.duration,c.completeCallback):this.container.slideUp(c.duration,c.completeCallback):(this.container.toggle(a),c.completeCallback&&c.completeCallback())},toggle:function(a){return 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,f=function(a){"string"==typeof a&&c.statuses&&c.statuses[a]?b.html(c.statuses[a]).show():b.hide()};this.container.on("click 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c.promise(),a=wp.ajax.post("customize_refresh_nonces",{wp_customize:"on",theme:e.settings.theme.stylesheet}),a.done(function(a){e.trigger("nonce-refresh",a),c.resolve()}),a.fail(function(){c.reject()}),c}}),e.controlConstructor={color:e.ColorControl,media:e.MediaControl,upload:e.UploadControl,image:e.ImageControl,header:e.HeaderControl,background:e.BackgroundControl,theme:e.ThemeControl},e.panelConstructor={},e.sectionConstructor={themes:e.ThemesSection},b(function(){if(e.settings=window._wpCustomizeSettings,e.l10n=window._wpCustomizeControlsL10n,e.settings){if(!b.support.postMessage||!b.support.cors&&e.settings.isCrossDomain)return window.location=e.settings.url.fallback;var a,c,d=b(document.body),f=d.children(".wp-full-overlay"),g=b("#customize-info .panel-title.site-title"),h=b(".customize-controls-close"),i=b("#save");b("#customize-controls").on("keydown",function(a){var 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c=b.controls(),d=_.pluck(c,"container");b.panel()||f.push(b),a=b.container.find("ul:first"),e.utils.areElementListsEqual(d,a.children("[id]"))||(_(c).each(function(b){a.append(b.container)}),g=!0)}),f.sort(e.utils.prioritySort),d=_.pluck(f,"container"),a=b("#customize-theme-controls").children("ul"),e.utils.areElementListsEqual(d,a.children())||(_(f).each(function(b){a.append(b.container)}),g=!0),e.panel.each(function(a){var b=a.active();a.active.callbacks.fireWith(a.active,[b,b])}),e.section.each(function(a){var b=a.active();a.active.callbacks.fireWith(a.active,[b,b])}),g&&c&&c.focus()},e),e.bind("ready",e.reflowPaneContents),e.reflowPaneContents=_.debounce(e.reflowPaneContents,100),b([e.panel,e.section,e.control]).each(function(a,b){b.bind("add",e.reflowPaneContents),b.bind("change",e.reflowPaneContents),b.bind("remove",e.reflowPaneContents)}),e.previewer.previewUrl()?e.previewer.refresh():e.previewer.previewUrl(e.settings.url.home),function(){var a=new e.Values,b=a.create("saved"),c=a.create("activated"),d=a.create("processing");a.bind("change",function(){c()?b()?(i.val(e.l10n.saved).prop("disabled",!0),h.find(".screen-reader-text").text(e.l10n.close)):(i.val(e.l10n.save).prop("disabled",!1),h.find(".screen-reader-text").text(e.l10n.cancel)):(i.val(e.l10n.activate).prop("disabled",!1),h.find(".screen-reader-text").text(e.l10n.cancel))}),b(!0),c(e.settings.theme.active),d(0),e.bind("change",function(){a("saved").set(!1)}),e.bind("saved",function(){a("saved").set(!0),a("activated").set(!0)}),c.bind(function(a){a&&e.trigger("activated")}),e.state=a}(),i.click(function(a){e.previewer.save(),a.preventDefault()}).keydown(function(a){9!==a.which&&(13===a.which&&e.previewer.save(),a.preventDefault())}),b("#customize-header-actions").on("click keydown",".control-panel-back",function(a){e.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),e.panel.each(function(a){a.collapse()}))}),h.keydown(function(a){9!==a.which&&(13===a.which&&this.click(),a.preventDefault())}),b(".collapse-sidebar").on("click keydown",function(a){e.utils.isKeydownButNotEnterEvent(a)||(f.toggleClass("collapsed").toggleClass("expanded"),a.preventDefault())}),b(".customize-controls-preview-toggle").on("click keydown",function(a){e.utils.isKeydownButNotEnterEvent(a)||(f.toggleClass("preview-only"),a.preventDefault())}),g.length&&b("#customize-control-blogname input").on("input",function(){g.text(this.value)}),a=new e.Messenger({url:e.settings.url.parent,channel:"loader"}),a.bind("back",function(){h.on("click.customize-controls-close",function(b){b.preventDefault(),a.send("close")})}),b(window).on("beforeunload",function(){return e.state("saved")()?void 0:(setTimeout(function(){f.removeClass("customize-loading")},1),e.l10n.saveAlert)}),b.each(["saved","change"],function(b,c){e.bind(c,function(){a.send(c)})}),e.bind("activated",function(){a.targetWindow()?a.send("activated",e.settings.url.activated):e.settings.url.activated&&(window.location=e.settings.url.activated)}),e.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){e(a,function(a){b.each(c.controls,function(b,d){e.control(d,function(b){var d=function(a){b.container.toggle(c.callback(a))};d(a.get()),a.bind(d)})})})}),e.control("display_header_text",function(a){var b="";a.elements[0].unsync(e("header_textcolor")),a.element=new e.Element(a.container.find("input")),a.element.set("blank"!==a.setting()),a.element.bind(function(c){c||(b=e("header_textcolor").get()),a.setting.set(c?b:"blank")}),a.setting.bind(function(b){a.element.set("blank"!==b)})}),e.trigger("ready"),c=h,c.focus(),setTimeout(function(){c.focus()},200)}})}(wp,jQuery);
\ No newline at end of file
diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index 98539b0294..47c0407f56 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -60,7 +60,25 @@ final class WP_Customize_Manager {
 	protected $customized;
 
 	/**
-	 * Controls that may be rendered from JS templates.
+	 * Panel types that may be rendered from JS templates.
+	 *
+	 * @since 4.3.0
+	 * @access protected
+	 * @var array
+	 */
+	protected $registered_panel_types = array();
+
+	/**
+	 * Section types that may be rendered from JS templates.
+	 *
+	 * @since 4.3.0
+	 * @access protected
+	 * @var array
+	 */
+	protected $registered_section_types = array();
+
+	/**
+	 * Control types that may be rendered from JS templates.
 	 *
 	 * @since 4.1.0
 	 * @access protected
@@ -612,19 +630,29 @@ final class WP_Customize_Manager {
 		}
 
 		foreach ( $this->settings as $id => $setting ) {
-			$settings['values'][ $id ] = $setting->js_value();
+			if ( $setting->check_capabilities() ) {
+				$settings['values'][ $id ] = $setting->js_value();
+			}
 		}
-		foreach ( $this->panels as $id => $panel ) {
-			$settings['activePanels'][ $id ] = $panel->active();
-			foreach ( $panel->sections as $id => $section ) {
-				$settings['activeSections'][ $id ] = $section->active();
+		foreach ( $this->panels as $panel_id => $panel ) {
+			if ( $panel->check_capabilities() ) {
+				$settings['activePanels'][ $panel_id ] = $panel->active();
+				foreach ( $panel->sections as $section_id => $section ) {
+					if ( $section->check_capabilities() ) {
+						$settings['activeSections'][ $section_id ] = $section->active();
+					}
+				}
 			}
 		}
 		foreach ( $this->sections as $id => $section ) {
-			$settings['activeSections'][ $id ] = $section->active();
+			if ( $section->check_capabilities() ) {
+				$settings['activeSections'][ $id ] = $section->active();
+			}
 		}
 		foreach ( $this->controls as $id => $control ) {
-			$settings['activeControls'][ $id ] = $control->active();
+			if ( $control->check_capabilities() ) {
+				$settings['activeControls'][ $id ] = $control->active();
+			}
 		}
 
 		?>
@@ -964,6 +992,34 @@ final class WP_Customize_Manager {
 		unset( $this->panels[ $id ] );
 	}
 
+	/**
+	 * Register a customize panel type.
+	 *
+	 * Registered types are eligible to be rendered via JS and created dynamically.
+	 *
+	 * @since 4.3.0
+	 * @access public
+	 *
+	 * @param string $panel Name of a custom panel which is a subclass of
+	 *                        {@see WP_Customize_Panel}.
+	 */
+	public function register_panel_type( $panel ) {
+		$this->registered_panel_types[] = $panel;
+	}
+
+	/**
+	 * Render JS templates for all registered panel types.
+	 *
+	 * @since 4.3.0
+	 * @access public
+	 */
+	public function render_panel_templates() {
+		foreach ( $this->registered_panel_types as $panel_type ) {
+			$panel = new $panel_type( $this, 'temp', array() );
+			$panel->print_template();
+		}
+	}
+
 	/**
 	 * Add a customize section.
 	 *
@@ -1005,6 +1061,34 @@ final class WP_Customize_Manager {
 		unset( $this->sections[ $id ] );
 	}
 
+	/**
+	 * Register a customize section type.
+	 *
+	 * Registered types are eligible to be rendered via JS and created dynamically.
+	 *
+	 * @since 4.3.0
+	 * @access public
+	 *
+	 * @param string $section Name of a custom section which is a subclass of
+	 *                        {@see WP_Customize_Section}.
+	 */
+	public function register_section_type( $section ) {
+		$this->registered_section_types[] = $section;
+	}
+
+	/**
+	 * Render JS templates for all registered section types.
+	 *
+	 * @since 4.3.0
+	 * @access public
+	 */
+	public function render_section_templates() {
+		foreach ( $this->registered_section_types as $section_type ) {
+			$section = new $section_type( $this, 'temp', array() );
+			$section->print_template();
+		}
+	}
+
 	/**
 	 * Add a customize control.
 	 *
@@ -1176,7 +1260,10 @@ final class WP_Customize_Manager {
 	 */
 	public function register_controls() {
 
-		/* Control Types (custom control classes) */
+		/* Panel, Section, and Control Types */
+		$this->register_panel_type( 'WP_Customize_Panel' );
+		$this->register_section_type( 'WP_Customize_Section' );
+		$this->register_section_type( 'WP_Customize_Sidebar_Section' );
 		$this->register_control_type( 'WP_Customize_Color_Control' );
 		$this->register_control_type( 'WP_Customize_Media_Control' );
 		$this->register_control_type( 'WP_Customize_Upload_Control' );
diff --git a/wp-includes/class-wp-customize-panel.php b/wp-includes/class-wp-customize-panel.php
index f977f06867..14a47b4e17 100644
--- a/wp-includes/class-wp-customize-panel.php
+++ b/wp-includes/class-wp-customize-panel.php
@@ -214,7 +214,7 @@ class WP_Customize_Panel {
 	 * @return array The array to be exported to the client as JSON.
 	 */
 	public function json() {
-		$array = wp_array_slice_assoc( (array) $this, array( 'title', 'description', 'priority', 'type' ) );
+		$array = wp_array_slice_assoc( (array) $this, array( 'id', 'title', 'description', 'priority', 'type' ) );
 		$array['content'] = $this->get_content();
 		$array['active'] = $this->active();
 		$array['instanceNumber'] = $this->instance_number;
@@ -289,48 +289,92 @@ class WP_Customize_Panel {
 	}
 
 	/**
-	 * Render the panel container, and then its contents.
+	 * Render the panel container, and then its contents (via `this->render_content()`) in a subclass.
+	 *
+	 * Panel containers are now rendered in JS by default, see {@see WP_Customize_Panel::print_template()}.
 	 *
 	 * @since 4.0.0
 	 * @access protected
 	 */
-	protected function render() {
-		$classes = 'accordion-section control-section control-panel control-panel-' . $this->type;
+	protected function render() {}
+
+	/**
+	 * Render the panel UI in a subclass.
+	 *
+	 * Panel contents are now rendered in JS by default, see {@see WP_Customize_Panel::print_template()}.
+	 *
+	 * @since 4.1.0
+	 * @access protected
+	 */
+	protected function render_content() {}
+
+	/**
+	 * Render the panel's JS templates.
+	 *
+	 * This function is only run for panel types that have been registered with
+	 * {@see WP_Customize_Manager::register_panel_type()}.
+	 *
+	 * @since 4.3.0
+	 */
+	public function print_template() {
 		?>
-		<li id="accordion-panel-<?php echo esc_attr( $this->id ); ?>" class="<?php echo esc_attr( $classes ); ?>">
+		<script type="text/html" id="tmpl-customize-panel-<?php echo esc_attr( $this->type ); ?>-content">
+			<?php $this->content_template(); ?>
+		</script>
+		<script type="text/html" id="tmpl-customize-panel-<?php echo esc_attr( $this->type ); ?>">
+			<?php $this->render_template(); ?>
+		</script>
+        <?php
+	}
+
+	/**
+	 * An Underscore (JS) template for rendering this panel's container.
+	 *
+	 * Class variables for this panel class are available in the `data` JS object;
+	 * export custom variables by overriding {@see WP_Customize_Panel::json()}.
+	 *
+	 * @see WP_Customize_Panel::print_template()
+	 *
+	 * @since 4.3.0
+	 */
+	protected function render_template() {
+		?>
+		<li id="accordion-panel-{{ data.id }}" class="accordion-section control-section control-panel control-panel-{{ data.type }}">
 			<h3 class="accordion-section-title" tabindex="0">
-				<?php echo esc_html( $this->title ); ?>
+				{{ data.title }}
 				<span class="screen-reader-text"><?php _e( 'Press return or enter to open this panel' ); ?></span>
 			</h3>
-			<ul class="accordion-sub-container control-panel-content">
-				<?php $this->render_content(); ?>
-			</ul>
+			<ul class="accordion-sub-container control-panel-content"></ul>
 		</li>
 		<?php
 	}
 
 	/**
-	 * Render the sections that have been added to the panel.
+	 * An Underscore (JS) template for this panel's content (but not its container).
 	 *
-	 * @since 4.1.0
-	 * @access protected
+	 * Class variables for this panel class are available in the `data` JS object;
+	 * export custom variables by overriding {@see WP_Customize_Panel::json()}.
+	 *
+	 * @see WP_Customize_Panel::print_template()
+	 *
+	 * @since 4.3.0
 	 */
-	protected function render_content() {
+	protected function content_template() {
 		?>
-		<li class="panel-meta customize-info accordion-section<?php if ( empty( $this->description ) ) { echo ' cannot-expand'; } ?>">
+		<li class="panel-meta customize-info accordion-section <# if ( ! data.description ) { #> cannot-expand<# } #>">
 			<button class="customize-panel-back" tabindex="-1"><span class="screen-reader-text"><?php _e( 'Back' ); ?></span></button>
 			<div class="accordion-section-title">
 				<span class="preview-notice"><?php
 					/* translators: %s is the site/panel title in the Customizer */
-					echo sprintf( __( 'You are customizing %s' ), '<strong class="panel-title">' . esc_html( $this->title ) . '</strong>' );
+					echo sprintf( __( 'You are customizing %s' ), '<strong class="panel-title">{{ data.title }}</strong>' );
 				?></span>
 				<button class="customize-help-toggle dashicons dashicons-editor-help" tabindex="0" aria-expanded="false"><span class="screen-reader-text"><?php _e( 'Help' ); ?></span></button>
 			</div>
-			<?php if ( ! empty( $this->description ) ) : ?>
+			<# if ( data.description ) { #>
 				<div class="description customize-panel-description">
-					<?php echo $this->description; ?>
+					{{{ data.description }}}
 				</div>
-			<?php endif; ?>
+			<# } #>
 		</li>
 		<?php
 	}
diff --git a/wp-includes/class-wp-customize-section.php b/wp-includes/class-wp-customize-section.php
index f41767c88d..a48f0dfacc 100644
--- a/wp-includes/class-wp-customize-section.php
+++ b/wp-includes/class-wp-customize-section.php
@@ -223,10 +223,18 @@ class WP_Customize_Section {
 	 * @return array The array to be exported to the client as JSON.
 	 */
 	public function json() {
-		$array = wp_array_slice_assoc( (array) $this, array( 'title', 'description', 'priority', 'panel', 'type' ) );
+		$array = wp_array_slice_assoc( (array) $this, array( 'id', 'title', 'description', 'priority', 'panel', 'type' ) );
 		$array['content'] = $this->get_content();
 		$array['active'] = $this->active();
 		$array['instanceNumber'] = $this->instance_number;
+
+		if ( $this->panel ) {
+			/* translators: &#9656; is the unicode right-pointing triangle, and %s is the section title in the Customizer */
+			$array['customizeAction'] = sprintf( __( 'Customizing &#9656; %s' ), esc_html( $this->manager->get_panel( $this->panel )->title ) );
+		} else {
+			$array['customizeAction'] = __( 'Customizing' );
+		}
+
 		return $array;
 	}
 
@@ -251,7 +259,7 @@ class WP_Customize_Section {
 	}
 
 	/**
-	 * Get the section's content template for insertion into the Customizer pane.
+	 * Get the section's content for insertion into the Customizer pane.
 	 *
 	 * @since 4.1.0
 	 *
@@ -297,16 +305,45 @@ class WP_Customize_Section {
 	}
 
 	/**
-	 * Render the section, and the controls that have been added to it.
+	 * Render the section UI in a subclass.
+	 *
+	 * Sections are now rendered in JS by default, see {@see WP_Customize_Section::print_template()}.
 	 *
 	 * @since 3.4.0
 	 */
-	protected function render() {
-		$classes = 'accordion-section control-section control-section-' . $this->type;
+	protected function render() {}
+
+	/**
+	 * Render the section's JS template.
+	 *
+	 * This function is only run for section types that have been registered with
+	 * {@see WP_Customize_Manager::register_section_type()}.
+	 *
+	 * @since 4.3.0
+	 */
+	public function print_template() {
+        ?>
+		<script type="text/html" id="tmpl-customize-section-<?php echo $this->type; ?>">
+			<?php $this->render_template(); ?>
+		</script>
+        <?php
+	}
+
+	/**
+	 * An Underscore (JS) template for rendering this section.
+	 *
+	 * Class variables for this section class are available in the `data` JS object;
+	 * export custom variables by overriding {@see WP_Customize_Section::json()}.
+	 *
+	 * @see WP_Customize_Section::print_template()
+	 *
+	 * @since 4.3.0
+	 */
+	protected function render_template() {
 		?>
-		<li id="accordion-section-<?php echo esc_attr( $this->id ); ?>" class="<?php echo esc_attr( $classes ); ?>">
+		<li id="accordion-section-{{ data.id }}" class="accordion-section control-section control-section-{{ data.type }}">
 			<h3 class="accordion-section-title" tabindex="0">
-				<?php echo esc_html( $this->title ); ?>
+				{{ data.title }}
 				<span class="screen-reader-text"><?php _e( 'Press return or enter to open' ); ?></span>
 			</h3>
 			<ul class="accordion-section-content">
@@ -316,20 +353,15 @@ class WP_Customize_Section {
 							<span class="screen-reader-text"><?php _e( 'Back' ); ?></span>
 						</button>
 						<h3>
-							<span class="customize-action"><?php
-								if ( $this->panel ) {
-									/* translators: &#9656; is the unicode right-pointing triangle, and %s is the section title in the Customizer */
-									echo sprintf( __( 'Customizing &#9656; %s' ), esc_html( $this->manager->get_panel( $this->panel )->title ) );
-								} else {
-									_e( 'Customizing' );
-								}
-							?></span>
-							<?php echo esc_html( $this->title ); ?>
+							<span class="customize-action">
+								{{{ data.customizeAction }}}
+							</span>
+							{{ data.title }}
 						</h3>
 					</div>
-					<?php if ( ! empty( $this->description ) ) : ?>
-						<p class="description customize-section-description"><?php echo $this->description; ?></p>
-					<?php endif; ?>
+					<# if ( data.description ) { #>
+						<p class="description customize-section-description">{{{ data.description }}}</p>
+					<# } #>
 				</li>
 			</ul>
 		</li>
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b75b868e20..3fcfd0eecd 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-alpha-32657';
+$wp_version = '4.3-alpha-32658';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.