Re: [webvtt-tests] WebVTT: Check for support of the API up front (#4994)

Notifying @r12a and @silviapfeiffer. *([Learn how reviewing works](https://github.com/w3c/web-platform-tests/blob/master/README.md#test-review).)*

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4994#issuecomment-281991029

Received on Thursday, 23 February 2017 13:27:55 UTC