Web/API/TrackDefault/TrackDefault

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ObsoleteThis feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The TrackDefault() constructor of the TrackDefault interface constructs and returns a new TrackDefault object.

Syntax

var trackDefault = new TrackDefault(type, language, label, kinds, byteStreamTrackID);

Parameters

type: A DOMString specifying a media segment data type for the SourceBuffer to contain. Can be audio, video, or text.
language: A DOMString specifying a default language for the SourceBuffer to use when an initialization segment does not contain language information for a new track.
label: A DOMString specifying a default label for the SourceBuffer to use when an initialization segment does not contain label information for a new track.
kinds: An array (sequence) of DOMStrings specifying default kinds for the SourceBuffer to use when an initialization segment does not contain kind information for a new track.
byteStreamTrackID Optional: A DOMString specifying the ID of the specific track that the SourceBuffer should apply to. If not specified, this value will be an empty string and the SourceBuffer can contain any tracks of the specified type.

Errors

when this constructor is invoked, the following errors can occur:

Error	Explanation
`InvalidAccessError`	The supplied `language` is not a valid language code, e.g. `en-US`.
`TypeError`	there are values specified in the `kinds` array that do not apply to the specified `type`.

Example

TBD

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`TrackDefault()` constructor Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.