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<video id="play" width="320" height="240" poster="" controls>
  <source src="video.mp4" type="video/mp4">
  <source src="video.ogg" type="video/ogg">
  Your browser does not support the video tag.
</video>

<script> 
  var video = document.getElementById("play"); 

  function play_video() { 
    video.play(); 
  }

  function pause_video() { 
    video.pause(); 
  }
</script>

<button onclick="play_video()" type="button">Play</button>
<button onclick="pause_video()" type="button">Pause</button>