title: Chrome html-video invisible start playing until I scroll the page
body: <p>I have built a site trying to play a video as a big background image.The element is invisible until i start scrolling. I have no javascript.</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  
  &lt;video class="background_video" poster="video/rain.jpg" autoplay muted="true" preload="auto" &gt;
    &lt;source type="video/mp4" src="video/rain.mp4"&gt;
    &lt;source type="video/ogv" src="video/rain.ogv"&gt;
    &lt;source type="video/webm" src="video/rain.webm"&gt;
  &lt;/video&gt;
  </code></pre>