title: Escape input key with unity3d WEB GL build
body: <p>I creating WEB GL game. Game menu is shown by the following code: </p>
  
  <pre><code>Input.GetKeyUp(KeyCode.Escape)
  </code></pre>
  
  <p>It works fine in unity and in the windows build. In the browser, escape pressing is intercepted by browser and the menu is not displayed.</p>
  
  <p>Is it possible to make this code working in WEB GL build? What is the standart "meny button" for WEB GL games?</p>