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<!DOCTYPE html> <html> <body> <script> function setPlaySpeed() { document.getElementById("myvideo").playbackRate = 0.3; } function myFunction() { alert("onratechange attribute fired - The playing speed of the video was changed"); } </script> <p>Click the button to trigger the "ratechange" event.</p> <video id="myvideo" autoplay controls onratechange="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> <br> <button onclick="setPlaySpeed()" type="button">Set video to be play in slow motion</button> <p>Video courtesy of <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p> </body> </html>
