The HTMLMediaElement.buffered read-only property returns a new TimeRanges object that indicates the ranges of the media source that the browser has buffered (if any) at the moment the buffered property is accessed.

Note: This feature is not available in Web Workers.


var timeRange = audioObject.buffered


A TimeRanges object. This object is normalized, which means that ranges are ordered, don't overlap, aren't empty, and don't touch (adjacent ranges are folded into one bigger range).


var obj = document.createElement('video');
console.log(obj.buffered); // TimeRanges { length: 0 }


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

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
bufferedChrome Full support 43Edge Full support 12Firefox Full support 4IE Full support 9Opera Full support YesSafari Full support 6WebView Android Full support 43Chrome Android Full support 43Firefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support 4.0


Full support  
Full support

See also