[ttml2] Pull Request: Add ttp:safeCropArea

nigelmegitt has just submitted a new pull request for 
https://github.com/w3c/ttml2:

== Add ttp:safeCropArea ==
Fix #173 by adding `ttp:safeCropArea` parameter attribute and
processing semantics as per BBC contribution at
https://github.com/w3c/ttml2/files/397449/Subtitle.Safe.Crop.Area.BBC.su
bmission.2016-06-09.pdf

See https://github.com/w3c/ttml2/pull/184

Received on Friday, 16 September 2016 15:20:34 UTC