<!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>