title: accept="video/mp4" accept webm files also
body: <p>I want to allow user to upload only mp4 videos. So I am using accept="video/mp4" in my input element. Following is my input element:</p>
  
  <pre><code> &lt;input id="chatFileUpload" type="file" style="display: none"  accept="image/*,video/mp4,audio/*"/&gt;
  </code></pre>
  
  <p>But it is also accepting webm video formats. How can I prevent it accepting webm files?</p>
  
  <p>But it accept only mp4 when I remove image/* and audio/* from accept as follows:</p>
  
  <pre><code>&lt;input id="chatFileUpload" type="file" style="display: none"  accept="video/mp4"/&gt;
  </code></pre>