HTML Audio/Video DOM ratechange Event

Example

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

// Get the <video> element with id="myVideo"
let 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.

Event
ratechange	Yes	9.0	Yes	Yes	Yes

Syntax

In HTML:

<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