Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1269712
Relevant change in standards: https://github.com/whatwg/html/issues/293, also maybe https://www.w3.org/2015/10/28-htmlcue-minutes.html Bugs filed against other UAs: https://bugs.chromium.org/p/chromium/issues/detail?id=608772 https://bugs.webkit.org/show_bug.cgi?id=157311 https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7426340/ Invalid values for <track kind> are currently treated as "subtitles" by all UAs, pursuant to old specs. This means that if we want to add any new values in the future, old UAs will treat them as subtitles, which might result in undesired behavior. As such, several months ago, the spec was changed to treat invalid values as "metadata", so UAs will ignore unrecognized values. No UA has yet implemented the new spec. The risk in implementing this is that sites might be inadvertently using invalid values right now and relying on the fact that they get treated as "subtitles". I haven't done any telemetry or other analysis at this point to gauge if this will be a problem in real life. If there are no objections, I intend to land this change on Sunday. _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
