title: Are there any specific requirements to enable "fast-start" progressive download with webm and ogg codecs?
body: <p>I know that with <code>mp4</code>, the <code>moov atom</code> must be placed at the beginning of the file to enable progressive downloading. That can be done by enabling "faststart" when creating the file.</p>
  
  <p>I'm curious if there are any similar requirements when dealing with <code>webm</code> or <code>ogg</code> files, or are they "progressive download ready" by default?</p>