[ttml2] tts:textCombine="digits" fallback

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

== tts:textCombine="digits" fallback ==
What should the fallback be if `tts:textCombine="all"` is supported, but `tts:textCombine="digits"` is not?

In particular CSS support for `text-combine-upright:digits` is not [universal](https://developer.mozilla.org/en-US/docs/Web/CSS/text-combine-upright).

Alternatively, should `tts:textCombine="digits"` be at-risk?

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/725 using your GitHub account

Received on Thursday, 3 May 2018 23:53:44 UTC