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<!DOCTYPE html> <html> <body> <video id="myVideo" width="320" height="176" controls ondurationchange="myFunction(this)"> <source src="mov_bbb.mp4" type="video/mp4"> <source src="mov_bbb.ogg" type="video/ogg"> Your browser does not support HTML5 video. </video> <script> function myFunction(x) { alert("The duration of this video is : " + x.duration + " seconds"); } </script> <p>This example demonstrates how to use the "ondurationchange" attribute on a VIDEO element.</p> <p><strong>Note:</strong> When the video is loaded, the "ondurationchange" event will occur, it changes from "NaN" to the actual duration of the video.</p> <p>Video courtesy of <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p> </body> </html>
