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<!DOCTYPE html> 
<html> 
<body> 
<video id="myVideo" width="320" height="240" controls>
  <source src="mov_broken.mp4" type="video/mp4">
  <source src="mov_broken.ogg" type="video/ogg">
  Your browser does not support the video tag.
</video>
<p>Click the button to get the error state of the video.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myVideo").error.code;
  document.getElementById("demo").innerHTML = x;
}
</script> 
</body> 
</html>