Consider VTT-based audio descriptions with text-to-speech. Pending patch for Chrome. https://chromium-review.googlesource.com/c/chromium/src/+/3808431
<rdar://problem/98206665>
Pull request: https://github.com/WebKit/WebKit/pull/3486
Committed 253931@main (969ac99ba7af): <https://commits.webkit.org/253931@main> Reviewed commits have been landed. Closing PR #3486 and removing active labels.
Re-opening for pull request https://github.com/WebKit/WebKit/pull/4112
Committed 254266@main (332cd88dafc8): <https://commits.webkit.org/254266@main> Reviewed commits have been landed. Closing PR #4112 and removing active labels.