[webvtt] Pull Request: Don't make edge margins depend on aesthetics.

silviapfeiffer has just submitted a new pull request for https://github.com/w3c/webvtt:

== Don't make edge margins depend on aesthetics. ==
This makes a start on #379 

See https://github.com/w3c/webvtt/pull/422

Received on Thursday, 21 December 2017 13:30:27 UTC