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<!DOCTYPE html> <html> <body> <p>This example uses the addEventListener() method to attach a "durationchange" 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 HTML5 video. </video> <p>Video courtesy of <a href="../../www.bigbuckbunny.org/index.html" target="_blank">Big Buck Bunny</a>.</p> <script> document.getElementById("myVideo").addEventListener("durationchange", myFunction); function myFunction() { alert("The video duration has changed"); } </script> </body> </html>