Re: [webvtt-tests] Expect setting VTTRegion.lines to negative to throw (#4959)

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/4959#issuecomment-281673644

Received on Wednesday, 22 February 2017 13:48:32 UTC