title: in chrome, html5 audio element will be mute unexpectedly
body: <p>I have followed some events and attributes:<br />
  All the events can't be fired at all, like progress canplay, play and so on.</p>
  
  <p>The attributes seems right:</p>
  
  <pre><code>muted: false, 
  loop: true,
  ended: false,
  autoplay:true,
  error: null.
  networkState: 2(The user agent is actively trying to download data.)
  readyState: 4(HAVE_FUTURE_DATA)
  seekable.end(0): 56.81632614135742
  </code></pre>
  
  <p>Some timeranges: </p>
  
  <pre><code>played.length: 0, 
  buffered.length: 1,
  buffered.end(0): 56.81632614135742,
  </code></pre>
  
  <p>And another strange thing: I open another site with a HTML5 sounds game, it's also mute.<br />
  Now the only way to solve the problem is closing the chrome and to open it again.<br />
  My chrome is ver.16</p>
  
  <p>Did you meet the same problem ? Dose this a problem of chrome ?</p>