title: Unrecognized feature: 'autoplay' error with YouTube embedded player
body: <p>Is anyone else seeing this warning in the browser console when loading a YouTube iFrame embed player using the data 3 API?</p>
  
  <pre><code>Unrecognized feature: 'autoplay'.
  </code></pre>
  
  <p>The error occurs in a Google file: www-widgetapi.js:110 it appears to be a JavaScript error (this is from line 110):</p>
  
  <pre><code>c.setAttribute("allowfullscreen",1);c.setAttribute("allow","autoplay; encrypted-media");
  </code></pre>
  
  <p>I assume the autoplay part should simply be: </p>
  
  <pre><code>c.setAttribute("autoplay",0);
  </code></pre>
  
  <p>The file is here: <a href="https://s.ytimg.com/yts/jsbin/www-widgetapi-vflkvQ6Kw/www-widgetapi.js" rel="noreferrer">https://s.ytimg.com/yts/jsbin/www-widgetapi-vflkvQ6Kw/www-widgetapi.js</a></p>
  
  <p>The error is even occurring on their developer demo page: <a href="https://developers.google.com/youtube/youtube_player_demo" rel="noreferrer">https://developers.google.com/youtube/youtube_player_demo</a></p>
  
  <p>How do people report these things to Google?</p>