[ttml1] Pull Request: Clarify #backgroundColor re: block, inline and region semantics

palemieux has just submitted a new pull request for https://github.com/w3c/ttml1:

== Clarify #backgroundColor re: block, inline and region semantics ==
Close #255

See https://github.com/w3c/ttml1/pull/256

Received on Tuesday, 14 November 2017 21:14:53 UTC