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<!DOCTYPE html> <html> <body> <video id="myVideo" width="320" height="240" 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="getPlaySpeed()" type="button">What is the default playback speed?</button> <button onclick="setPlaySpeed()" type="button">Set video to be play in slow motion</button> <script> var x = document.getElementById("myVideo"); function getPlaySpeed() { alert(x.defaultPlaybackRate); } function setPlaySpeed() { x.defaultPlaybackRate = 0.5; x.load(); } </script> </body> </html>