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<!DOCTYPE html> 
<html> 
<body> 
<video id="myVideo" width="320" height="240" controls>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
  Your browser does not support the video tag.
</video><br>
<button onclick="enableLoop()" type="button">Enable loop</button>
<button onclick="disableLoop()" type="button">Disable loop</button>
<button onclick="checkLoop()" type="button">Check loop status</button>
<script>
var x = document.getElementById("myVideo");
function enableLoop() { 
  x.loop = true;
  x.load();
} 
function disableLoop() { 
  x.loop = false;
  x.load();
} 
function checkLoop() { 
  alert(x.loop);
} 
</script> 
</body> 
</html>