title: HTML audio works with src, but not with <source>
body: <p>In my angular app I need to use the <code>&lt;audio&gt;</code> tag with the <code>&lt;source&gt;</code> element inside of it.
  This works:</p>
  <pre><code>&lt;audio [src]=&quot;path | secure | async&quot;&gt;&lt;/audio&gt;
  </code></pre>
  <p>This doesn't:</p>
  <pre><code>&lt;audio&gt;
     &lt;source [src]=&quot;path | secure | async&quot;&gt;
  &lt;/audio&gt;
  </code></pre>
  <p>I tried adding type, but got same results. I tried calling audio.load(). The source element in DOM has the source properly set, but audio won't play.</p>