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<!DOCTYPE html> <html> <body> <video id="myVideo" width="320" height="176" controls onloadstart="myFunction()"> <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>Play the video:</p> <script> function myFunction() { alert("The media file has started loading"); } </script> <p>This example demonstrates how to use the "onloadstart" attribute on a VIDEO element.</p> <p>Video courtesy of <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p> </body> </html>
