Invalid values for <track kind> are currently treated as "subtitles". This means that any new values will be treated as subtitles by old UAs. Instead use "metadata" as the "invalid value default", to avoid UAs showing <track>s with unrecognized values.



Established standard

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 52
  • Chrome for Android release 52
  • Android WebView release 52

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Shipped/Shipping
  • No signal
  • No signal
  • No signals


Last updated on 2021-05-05