[webvtt] Pull Request: Add a section that explains the CSS extensions to authors.

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

== Add a section that explains the CSS extensions to authors. ==
No substantial changes are necessary to the rendering sections, since 
the new section is merely informative.
Some small cleanup of the rendering section title and subsectioning is
 included.

Closes #313 
Closes https://www.w3.org/Bugs/Public/show_bug.cgi?id=28408

See https://github.com/w3c/webvtt/pull/317

Received on Wednesday, 12 October 2016 01:22:26 UTC