[ttml2] Add auto to tts:rubyOffset.

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

== Add auto to tts:rubyOffset. ==
Add ``auto`` value and semantics to tts:rubyOffset, making this the default initial value.

Editorial note from 2015-02-18.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/373 using your GitHub account

Received on Monday, 5 June 2017 00:40:57 UTC