[ttml2] Clarify that tts:visibility hidden on ancestor doesn't prevent visible on descendant.

skynavga has just created a new issue for 
https://github.com/w3c/ttml2:

== Clarify that tts:visibility hidden on ancestor doesn't prevent 
visible on descendant. ==
The current text on tts:visibility may be read such that if 
tts:visibility is hidden on an element, then all descendants are 
hidden, even if they specify tts:visibility as visible. This reading 
is not intended, so a note or additional clarifying text should be 
added to indicate that descendants may be visible.

Please view or discuss this issue at 
https://github.com/w3c/ttml2/issues/148 using your GitHub account

Received on Friday, 12 February 2016 16:30:03 UTC