[Malleys]

<script>
addEventListener("blur", function() {
    for(const video of document.querySelectorAll("video"))
        video.pause();
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</script>

<!-- видео для примера -->
<video controls loop> 
  <source src="http://techslides.com/demos/sample-videos/small.webm" type="video/webm">  
  <source src="http://techslides.com/demos/sample-videos/small.mp4" type="video/mp4">
</video>