[ttml2] Add top and bottom values to display align. (#1026)

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

== Add top and bottom values to display align. ==
Add `top` and `bottom` values to `tts:displayAlign` and add `#displayAlign-absolute feature`; N.B. we defined `#displayAlign-relative` in TTML2 but it constitutes all values in TTML1, which did not have absolute values (`top`, `bottom`).

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/1026 using your GitHub account

Received on Wednesday, 2 January 2019 04:29:24 UTC