Reflected attributes should be removed when 'null', 'undefined' or 'false' is specified

Source/core/html/HTMLMarqueeElement.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 installClass('HTMLMarqueeElement', function(global) {
 
     var kDefaultScrollAmount = 6;
     var kDefaultScrollDelayMS = 85;
@@ skipping 44 matching lines @@
             enumerable: true,
         });
     }
 
     function reflectBooleanAttribute(prototype, attributeName, propertyName) {
         Object.defineProperty(prototype, propertyName, {
             get: function() {
                 return this.hasAttribute(attributeName);
             },
             set: function(value) {
-                if (value.valueOf() === false)
+                if (value)
+                    this.setAttribute(attributeName, '');
+                else
                     this.removeAttribute(attributeName);
-                else
-                    this.setAttribute(attributeName, value ? '' : null);
             },
         });
     }
 
     function defineInlineEventHandler(prototype, eventName) {
         var propertyName = 'on' + eventName;
         // FIXME: We should use symbols here instead.
         var functionPropertyName = propertyName + 'Function_';
         var eventHandlerPropertyName = propertyName + 'EventHandler_';
         Object.defineProperty(prototype, propertyName, {
@@ skipping 321 matching lines @@
     };
 
     // FIXME: We have to inject this HTMLMarqueeElement as a custom element in order to make
     // createdCallback, attachedCallback, detachedCallback and attributeChangedCallback workable.
     // global.document.registerElement('i-marquee', {
     //    prototype: HTMLMarqueeElementPrototype,
     // });
 
     return HTMLMarqueeElementPrototype;
 });