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The HTMLMediaElement.duration property gives the length of the media in seconds, or zero if no media data is available.


var myDuration = audioOrVideo.duration


A double. If the media data is available but the length is unknown, this value is NaN. If the media is streamed and has no predefined length, the value is Inf.


var obj = document.createElement('video');
console.log(obj.duration); // NaN


Specification Status Comment
HTML Living Standard
The definition of 'HTMLMediaElement.duration' in that specification.
Living Standard No change from HTML5
The definition of 'HTMLMediaElement.duration' in that specification.
Recommendation Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) 3.5 (1.9.1) [1] 9 ? ?
Feature Android Edge Firefox Mobile (Gecko) Firefox OS (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) ? (Yes) (Yes)

See also

Document Tags and Contributors

 Contributors to this page: erikadoyle, markg
 Last updated by: erikadoyle,