[imsc] Pull Request: Clarify that tts:fillLineGap does not hide characters

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

== Clarify that tts:fillLineGap does not hide characters ==
Close #254

See https://github.com/w3c/imsc/pull/283

Received on Thursday, 9 November 2017 19:55:40 UTC