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<html> <body> <h1>HTML DOM Events</h1><h2>The onloadstart Event</h2><p>Use the addEventListener() method to attach a "loadstart" event to a video element.</p><video controls id="myVideo"> <source src="mov_bbb.mp4" type="video/mp4"> <source src="mov_bbb.ogg" type="video/ogg"> Your browser does not support video playback.</video><p id="demo">Event has fired: </p><p>Video courtesy of <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p><script>document.getElementById("myVideo").addEventListener("loadstart", myFunction);function myFunction() { document.getElementById("demo").innerHTML += "Starting to load video";}</script></body> </html>