As seen in #160, the element is gaining text track support. However, the element still does not expose captions/subtitles in a way that works with Media Chrome’s textTracks integration.

Current behavior
• YouTube videos may have captions available via the YouTube player API.
• The element does not currently map these captions to TextTrackList.
• As a result, Media Chrome controls (like subtitle menus) cannot display or toggle captions.

Expected behavior
• should expose captions/subtitles through the standard textTracks API.
• Media Chrome should be able to list and toggle these tracks just like with native