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<html> <body> <p>In this example, we use the HTML DOM to assign an "onratechange" event to a video element. The playbackRate property is used to change the playing speed of the video.</p><video id="myVideo" width="320" height="240" autoplay controls> <source src="movie.mp4" type="video/mp4"> <source src="movie.ogg" type="video/ogg"> Your browser does not support the video tag.</video><br><button onclick="setPlaySpeed()" type="button">Set video to be play in slow motion</button><script>// Get the video element with id="myVideo"var x = document.getElementById("myVideo");// Set the current playback speed of the video to 0.3 (slow motion)function setPlaySpeed() { x.playbackRate = 0.3;} // Assign an onratechange event to the video element, and execute a function if the playing speed of the video is changedx.onratechange = function() {myFunction()};function myFunction() { alert("The playing speed of the video was changed");}</script> </body> </html>