title: window.close() doesn't work on iOS 8 GM seed
body: <p>I am trying to open new tab via <code>Javascript</code> using <code>window.open()</code>, then using <code>window.close()</code> to close, but it seems <code>window.close()</code> doesn't work in safari( iOS 8 GM seed). Here is the code: </p>
  
  <p>A.html:</p>
  
  <p><code>&lt;button onclick="window.open('./B.html'); return false;"&gt;Open B&lt;/button&gt;</code></p>
  
  <p>B.html:</p>
  
  <p><code>&lt;button onclick="window.close();"&gt;Close&lt;/button&gt;</code></p>
  
  <p>I tried several ways like: <strong>setTimeout</strong>, <code>window.open()</code> then close, but doesn't help.</p>
  
  <p>Is there any workaround for this situation?</p>