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VideoTrackList.selectedIndex

The read-only VideoTrackList property selectedIndex returns the index of the currently selected track, if any, or -1 otherwise.

var index = VideoTrackList.selectedIndex;

A number indicating the index of the currently selected track, if any, or -1 otherwise.

Specification	Status	Comment
HTML Living Standard The definition of 'VideoTrackList: selectedIndex' in that specification.	Living Standard

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	45 Disabled 45 Disabled Disabled From version 45: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled`). To change preferences in Chrome, visit chrome://flags.	12	33 Disabled 33 Disabled Disabled From version 33: this feature is behind the `media.track.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	10	32 Disabled 32 Disabled Disabled From version 32: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled`).	6.1

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	?	45 Disabled 45 Disabled Disabled From version 45: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled`). To change preferences in Chrome, visit chrome://flags.	Yes	33 Disabled 33 Disabled Disabled From version 33: this feature is behind the `media.track.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	32 Disabled 32 Disabled Disabled From version 32: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled`).	7.1	?

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/VideoTrackList/selectedIndex