diff --git a/wp-includes/js/customize-base.js b/wp-includes/js/customize-base.js
index 6ea282292a..5ffa924564 100644
--- a/wp-includes/js/customize-base.js
+++ b/wp-includes/js/customize-base.js
@@ -426,10 +426,14 @@ window.wp = window.wp || {};
 
 				if ( this.element.is('input') ) {
 					type = this.element.prop('type');
-					if ( api.Element.synchronizer[ type ] )
+					if ( api.Element.synchronizer[ type ] ) {
 						synchronizer = api.Element.synchronizer[ type ];
-					if ( 'text' === type || 'password' === type )
+					}
+					if ( 'text' === type || 'password' === type ) {
 						this.events += ' keyup';
+					} else if ( 'range' === type ) {
+						this.events += ' input propertychange';
+					}
 				} else if ( this.element.is('textarea') ) {
 					this.events += ' keyup';
 				}
diff --git a/wp-includes/js/customize-base.min.js b/wp-includes/js/customize-base.min.js
index 3b0ae40827..ee500b2053 100644
--- a/wp-includes/js/customize-base.min.js
+++ b/wp-includes/js/customize-base.min.js
@@ -1 +1 @@
-window.wp=window.wp||{},function(a,b){var c,d,e={},f=Array.prototype.slice;c=function(){},d=function(a,d,e){var f;return f=d&&d.hasOwnProperty("constructor")?d.constructor:function(){var b=a.apply(this,arguments);return b},b.extend(f,a),c.prototype=a.prototype,f.prototype=new c,d&&b.extend(f.prototype,d),e&&b.extend(f,e),f.prototype.constructor=f,f.__super__=a.prototype,f},e.Class=function(a,c,d){var f,g=arguments;return a&&c&&e.Class.applicator===a&&(g=c,b.extend(this,d||{})),f=this,this.instance&&(f=function(){return f.instance.apply(f,arguments)},b.extend(f,this)),f.initialize.apply(f,g),f},e.Class.extend=function(a,b){var c=d(this,a,b);return c.extend=this.extend,c},e.Class.applicator={},e.Class.prototype.initialize=function(){},e.Class.prototype.extended=function(a){for(var b=this;"undefined"!=typeof b.constructor;){if(b.constructor===a)return!0;if("undefined"==typeof b.constructor.__super__)return!1;b=b.constructor.__super__}return!1},e.Events={trigger:function(a){return this.topics&&this.topics[a]&&this.topics[a].fireWith(this,f.call(arguments,1)),this},bind:function(a){return this.topics=this.topics||{},this.topics[a]=this.topics[a]||b.Callbacks(),this.topics[a].add.apply(this.topics[a],f.call(arguments,1)),this},unbind:function(a){return this.topics&&this.topics[a]&&this.topics[a].remove.apply(this.topics[a],f.call(arguments,1)),this}},e.Value=e.Class.extend({initialize:function(a,c){this._value=a,this.callbacks=b.Callbacks(),this._dirty=!1,b.extend(this,c||{}),this.set=b.proxy(this.set,this)},instance:function(){return arguments.length?this.set.apply(this,arguments):this.get()},get:function(){return this._value},set:function(a){var b=this._value;return a=this._setter.apply(this,arguments),a=this.validate(a),null===a||_.isEqual(b,a)?this:(this._value=a,this._dirty=!0,this.callbacks.fireWith(this,[a,b]),this)},_setter:function(a){return a},setter:function(a){var b=this.get();return this._setter=a,this._value=null,this.set(b),this},resetSetter:function(){return this._setter=this.constructor.prototype._setter,this.set(this.get()),this},validate:function(a){return a},bind:function(){return this.callbacks.add.apply(this.callbacks,arguments),this},unbind:function(){return this.callbacks.remove.apply(this.callbacks,arguments),this},link:function(){var a=this.set;return b.each(arguments,function(){this.bind(a)}),this},unlink:function(){var a=this.set;return b.each(arguments,function(){this.unbind(a)}),this},sync:function(){var a=this;return b.each(arguments,function(){a.link(this),this.link(a)}),this},unsync:function(){var a=this;return b.each(arguments,function(){a.unlink(this),this.unlink(a)}),this}}),e.Values=e.Class.extend({defaultConstructor:e.Value,initialize:function(a){b.extend(this,a||{}),this._value={},this._deferreds={}},instance:function(a){return 1===arguments.length?this.value(a):this.when.apply(this,arguments)},value:function(a){return this._value[a]},has:function(a){return"undefined"!=typeof this._value[a]},add:function(a,b){return this.has(a)?this.value(a):(this._value[a]=b,b.parent=this,b.extended(e.Value)&&b.bind(this._change),this.trigger("add",b),this._deferreds[a]&&this._deferreds[a].resolve(),this._value[a])},create:function(a){return this.add(a,new this.defaultConstructor(e.Class.applicator,f.call(arguments,1)))},each:function(a,c){c="undefined"==typeof c?this:c,b.each(this._value,function(b,d){a.call(c,d,b)})},remove:function(a){var b;this.has(a)&&(b=this.value(a),this.trigger("remove",b),b.extended(e.Value)&&b.unbind(this._change),delete b.parent),delete this._value[a],delete this._deferreds[a]},when:function(){var a=this,c=f.call(arguments),d=b.Deferred();return b.isFunction(c[c.length-1])&&d.done(c.pop()),b.when.apply(b,b.map(c,function(c){return a.has(c)?void 0:a._deferreds[c]=a._deferreds[c]||b.Deferred()})).done(function(){var e=b.map(c,function(b){return a(b)});return e.length!==c.length?void a.when.apply(a,c).done(function(){d.resolveWith(a,e)}):void d.resolveWith(a,e)}),d.promise()},_change:function(){this.parent.trigger("change",this)}}),b.extend(e.Values.prototype,e.Events),e.ensure=function(a){return"string"==typeof a?b(a):a},e.Element=e.Value.extend({initialize:function(a,c){var d,f,g,h=this,i=e.Element.synchronizer.html;this.element=e.ensure(a),this.events="",this.element.is("input, select, textarea")&&(this.events+="change",i=e.Element.synchronizer.val,this.element.is("input")?(d=this.element.prop("type"),e.Element.synchronizer[d]&&(i=e.Element.synchronizer[d]),("text"===d||"password"===d)&&(this.events+=" keyup")):this.element.is("textarea")&&(this.events+=" keyup")),e.Value.prototype.initialize.call(this,null,b.extend(c||{},i)),this._value=this.get(),f=this.update,g=this.refresh,this.update=function(a){a!==g.call(h)&&f.apply(this,arguments)},this.refresh=function(){h.set(g.call(h))},this.bind(this.update),this.element.bind(this.events,this.refresh)},find:function(a){return b(a,this.element)},refresh:function(){},update:function(){}}),e.Element.synchronizer={},b.each(["html","val"],function(a,b){e.Element.synchronizer[b]={update:function(a){this.element[b](a)},refresh:function(){return this.element[b]()}}}),e.Element.synchronizer.checkbox={update:function(a){this.element.prop("checked",a)},refresh:function(){return this.element.prop("checked")}},e.Element.synchronizer.radio={update:function(a){this.element.filter(function(){return this.value===a}).prop("checked",!0)},refresh:function(){return this.element.filter(":checked").val()}},b.support.postMessage=!!window.postMessage,e.Messenger=e.Class.extend({add:function(a,b,c){return this[a]=new e.Value(b,c)},initialize:function(a,c){var d=window.parent==window?null:window.parent;b.extend(this,c||{}),this.add("channel",a.channel),this.add("url",a.url||""),this.add("targetWindow",a.targetWindow||d),this.add("origin",this.url()).link(this.url).setter(function(a){return a.replace(/([^:]+:\/\/[^\/]+).*/,"$1")}),this.receive=b.proxy(this.receive,this),this.receive.guid=b.guid++,b(window).on("message",this.receive)},destroy:function(){b(window).off("message",this.receive)},receive:function(a){var b;a=a.originalEvent,this.targetWindow()&&(this.origin()&&a.origin!==this.origin()||"string"==typeof a.data&&"{"===a.data[0]&&(b=JSON.parse(a.data),b&&b.id&&"undefined"!=typeof b.data&&(!b.channel&&!this.channel()||this.channel()===b.channel)&&this.trigger(b.id,b.data)))},send:function(a,b){var c;b="undefined"==typeof b?null:b,this.url()&&this.targetWindow()&&(c={id:a,data:b},this.channel()&&(c.channel=this.channel()),this.targetWindow().postMessage(JSON.stringify(c),this.origin()))}}),b.extend(e.Messenger.prototype,e.Events),e=b.extend(new e.Values,e),e.get=function(){var a={};return this.each(function(b,c){a[c]=b.get()}),a},a.customize=e}(wp,jQuery);
\ No newline at end of file
+window.wp=window.wp||{},function(a,b){var c,d,e={},f=Array.prototype.slice;c=function(){},d=function(a,d,e){var f;return f=d&&d.hasOwnProperty("constructor")?d.constructor:function(){var b=a.apply(this,arguments);return b},b.extend(f,a),c.prototype=a.prototype,f.prototype=new c,d&&b.extend(f.prototype,d),e&&b.extend(f,e),f.prototype.constructor=f,f.__super__=a.prototype,f},e.Class=function(a,c,d){var f,g=arguments;return a&&c&&e.Class.applicator===a&&(g=c,b.extend(this,d||{})),f=this,this.instance&&(f=function(){return f.instance.apply(f,arguments)},b.extend(f,this)),f.initialize.apply(f,g),f},e.Class.extend=function(a,b){var c=d(this,a,b);return c.extend=this.extend,c},e.Class.applicator={},e.Class.prototype.initialize=function(){},e.Class.prototype.extended=function(a){for(var b=this;"undefined"!=typeof b.constructor;){if(b.constructor===a)return!0;if("undefined"==typeof b.constructor.__super__)return!1;b=b.constructor.__super__}return!1},e.Events={trigger:function(a){return this.topics&&this.topics[a]&&this.topics[a].fireWith(this,f.call(arguments,1)),this},bind:function(a){return this.topics=this.topics||{},this.topics[a]=this.topics[a]||b.Callbacks(),this.topics[a].add.apply(this.topics[a],f.call(arguments,1)),this},unbind:function(a){return this.topics&&this.topics[a]&&this.topics[a].remove.apply(this.topics[a],f.call(arguments,1)),this}},e.Value=e.Class.extend({initialize:function(a,c){this._value=a,this.callbacks=b.Callbacks(),this._dirty=!1,b.extend(this,c||{}),this.set=b.proxy(this.set,this)},instance:function(){return arguments.length?this.set.apply(this,arguments):this.get()},get:function(){return this._value},set:function(a){var b=this._value;return a=this._setter.apply(this,arguments),a=this.validate(a),null===a||_.isEqual(b,a)?this:(this._value=a,this._dirty=!0,this.callbacks.fireWith(this,[a,b]),this)},_setter:function(a){return a},setter:function(a){var b=this.get();return 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this._value[a]},has:function(a){return"undefined"!=typeof this._value[a]},add:function(a,b){return this.has(a)?this.value(a):(this._value[a]=b,b.parent=this,b.extended(e.Value)&&b.bind(this._change),this.trigger("add",b),this._deferreds[a]&&this._deferreds[a].resolve(),this._value[a])},create:function(a){return this.add(a,new this.defaultConstructor(e.Class.applicator,f.call(arguments,1)))},each:function(a,c){c="undefined"==typeof c?this:c,b.each(this._value,function(b,d){a.call(c,d,b)})},remove:function(a){var b;this.has(a)&&(b=this.value(a),this.trigger("remove",b),b.extended(e.Value)&&b.unbind(this._change),delete b.parent),delete this._value[a],delete this._deferreds[a]},when:function(){var a=this,c=f.call(arguments),d=b.Deferred();return b.isFunction(c[c.length-1])&&d.done(c.pop()),b.when.apply(b,b.map(c,function(c){return a.has(c)?void 0:a._deferreds[c]=a._deferreds[c]||b.Deferred()})).done(function(){var e=b.map(c,function(b){return a(b)});return e.length!==c.length?void a.when.apply(a,c).done(function(){d.resolveWith(a,e)}):void d.resolveWith(a,e)}),d.promise()},_change:function(){this.parent.trigger("change",this)}}),b.extend(e.Values.prototype,e.Events),e.ensure=function(a){return"string"==typeof a?b(a):a},e.Element=e.Value.extend({initialize:function(a,c){var d,f,g,h=this,i=e.Element.synchronizer.html;this.element=e.ensure(a),this.events="",this.element.is("input, select, textarea")&&(this.events+="change",i=e.Element.synchronizer.val,this.element.is("input")?(d=this.element.prop("type"),e.Element.synchronizer[d]&&(i=e.Element.synchronizer[d]),"text"===d||"password"===d?this.events+=" keyup":"range"===d&&(this.events+=" input propertychange")):this.element.is("textarea")&&(this.events+=" keyup")),e.Value.prototype.initialize.call(this,null,b.extend(c||{},i)),this._value=this.get(),f=this.update,g=this.refresh,this.update=function(a){a!==g.call(h)&&f.apply(this,arguments)},this.refresh=function(){h.set(g.call(h))},this.bind(this.update),this.element.bind(this.events,this.refresh)},find:function(a){return b(a,this.element)},refresh:function(){},update:function(){}}),e.Element.synchronizer={},b.each(["html","val"],function(a,b){e.Element.synchronizer[b]={update:function(a){this.element[b](a)},refresh:function(){return this.element[b]()}}}),e.Element.synchronizer.checkbox={update:function(a){this.element.prop("checked",a)},refresh:function(){return this.element.prop("checked")}},e.Element.synchronizer.radio={update:function(a){this.element.filter(function(){return this.value===a}).prop("checked",!0)},refresh:function(){return this.element.filter(":checked").val()}},b.support.postMessage=!!window.postMessage,e.Messenger=e.Class.extend({add:function(a,b,c){return this[a]=new e.Value(b,c)},initialize:function(a,c){var d=window.parent==window?null:window.parent;b.extend(this,c||{}),this.add("channel",a.channel),this.add("url",a.url||""),this.add("targetWindow",a.targetWindow||d),this.add("origin",this.url()).link(this.url).setter(function(a){return a.replace(/([^:]+:\/\/[^\/]+).*/,"$1")}),this.receive=b.proxy(this.receive,this),this.receive.guid=b.guid++,b(window).on("message",this.receive)},destroy:function(){b(window).off("message",this.receive)},receive:function(a){var b;a=a.originalEvent,this.targetWindow()&&(this.origin()&&a.origin!==this.origin()||"string"==typeof a.data&&"{"===a.data[0]&&(b=JSON.parse(a.data),b&&b.id&&"undefined"!=typeof b.data&&(!b.channel&&!this.channel()||this.channel()===b.channel)&&this.trigger(b.id,b.data)))},send:function(a,b){var c;b="undefined"==typeof b?null:b,this.url()&&this.targetWindow()&&(c={id:a,data:b},this.channel()&&(c.channel=this.channel()),this.targetWindow().postMessage(JSON.stringify(c),this.origin()))}}),b.extend(e.Messenger.prototype,e.Events),e=b.extend(new e.Values,e),e.get=function(){var a={};return this.each(function(b,c){a[c]=b.get()}),a},a.customize=e}(wp,jQuery);
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5678f7fe88..ec9b0dd2a0 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.1-alpha-30218';
+$wp_version = '4.1-alpha-30219';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.