JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <body>
        <div> 
            <video controls autoplay="">
              <source src="http://stream.flowplayer.org/bauhaus/624x260.webm" type="video/webm">
              <source src="http://stream.flowplayer.org/bauhaus/624x260.mp4" type="video/mp4">          
            </video> 
        </div>
        <div>
            <a href="mailto:foo@bar.com">Email</a><br>
            <a href="http://zombo.com" target="_blank">External link</a>            
        </div>
    </body>
</html>

JavaScript

$(window).on('beforeunload', function(){
  console.log('beforeunload called');  
});