npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

polymer_0.4.0/bower_components/web-animations-js/tutorial/try-it-yourself.js

 /*
  * Copyright 2013 Google Inc. All Rights Reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
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   var label = document.getElementById('hideLabel');
 
   if (elementStyle.display === 'none') {
     element.style.display = 'block';
     label.innerHTML = 'Hide Solution';
   } else if (elementStyle.display === 'block') {
     element.style.display = 'none';
     label.innerHTML = 'Show Solution';
   }
 }