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HTML Audio/Video DOM ratechange Event

❮ HTML Audio/Video DOM Reference


Change the playing speed of a video and alert that the speed was changed:

// Get the <video> element with id="myVideo"
var vid = document.getElementById("myVideo");

// Set the current playback speed of the video to 0.3 (slow motion)
function setPlaySpeed() {
    vid.playbackRate = 0.3;

// Assign a ratechange event to the <video> element, and execute a function if the playing speed of the video is changed. The function will alert some text
vid.onratechange = function() {myFunction()};

function myFunction() {
    alert("The playing speed of the video was changed");
Try it Yourself »

Definition and Usage

The ratechange event occurs when the playing speed of the audio/video is changed (like when a user switches to a slow motion or fast forward mode).

This event is invoked by the playbackRate property of the Audio/Video Object, which sets or returns the current playback speed of an audio/video.

Browser Support

The numbers in the table specify the first browser version that fully supports the event.

ratechange Yes 9.0 Yes Yes Yes



<audio|video onratechange="myScript">Try it

In JavaScript:

audio|video.onratechange=function(){myScript};Try it

In JavaScript, using the addEventListener() method:

audio|video.addEventListener("ratechange", myScript);Try it

Technical Details

Supported HTML tags: <audio> and <video>
Supported JavaScript objects: Audio, Video

❮ HTML Audio/Video DOM Reference