Audio Tracks
- LSMethod of specifying and selecting between multiple audio tracks. Useful for providing audio descriptions, director's commentary, additional languages, alternative takes, etc.
Chrome
- 4 - 44: Not supported
- 45 - 122: Disabled by default
- 123: Disabled by default
- 124 - 126: Disabled by default
Edge
- 12 - 18: Supported
- 79 - 122: Disabled by default
- 123: Disabled by default
Safari
- 3.1 - 6: Not supported
- 6.1 - 17.3: Supported
- 17.4: Supported
- TP: Supported
Firefox
- 2 - 32: Not supported
- 33 - 123: Disabled by default
- 124: Disabled by default
- 125 - 127: Disabled by default
Opera
- 9 - 31: Not supported
- 32 - 107: Disabled by default
- 108: Disabled by default
IE
- 5.5 - 9: Not supported
- 10: Supported
- 11: Supported
Chrome for Android
- 122: Disabled by default
Safari on iOS
- 3.2 - 6.1: Not supported
- 7 - 17.3: Supported
- 17.4: Supported
Samsung Internet
- 4 - 22: Not supported
- 23: Not supported
Opera Mini
- all: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 80: Disabled by default
UC Browser for Android
- 15.5: Disabled by default
Android Browser
- 2.1 - 4.4.4: Not supported
- 122: Not supported
Firefox for Android
- 123: Not supported
QQ Browser
- 14.9: Disabled by default
Baidu Browser
- 13.52: Disabled by default
KaiOS Browser
- 2.5: Disabled by default
- 3: Disabled by default