title: HTML5 Audio playback of aac stream does not work in iOS 11 with type="audio/mp4"
body: <p>I encountered a problem with iOS 11 not being able to stream audio files from a HTML audio element. The file is an aac file hosted externally.</p>
  
  <p>This is the code example:</p>
  
  <pre><code>&lt;audio controls&gt;
    &lt;source src="http://techslides.com/demos/samples/sample.aac" type="audio/mp4"&gt;
  &lt;/audio&gt;
  </code></pre>
  
  <p>I solved this by changing the type to "audio/mpeg", but wanted to add this to stackoverflow to prevent other people from having to look for the bug for ages.</p>
  
  <p>You can open this link in iOS to view what goes wrong.
  <a href="https://embed.plnkr.co/Z0fE5t5ycS1syKrKf1Nf/?show=preview" rel="nofollow noreferrer">https://embed.plnkr.co/Z0fE5t5ycS1syKrKf1Nf/?show=preview</a></p>