[ttml2] Feature #extent-measure also affects <length>

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

== Feature #extent-measure also affects <length> ==
When someone wants to set the `tts:extent` attribute to a `<length>` value, support of the [`#extent-measure` feature](https://w3c.github.io/ttml2/#feature-extent-measure) is required. The reason is that one can only get to `<length>` through `<measure>` here. 

As IMSC 1.1 currently prohibits the mentioned feature, thus also the usage of `<length>` is prohibited!

So it should be possible to allow the usage of `<length>` and prohibit the other values of `<measure>` at the same time. To address this e.g. the `#extent-measure` feature could be splitted somehow.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/730 using your GitHub account

Received on Friday, 11 May 2018 13:12:50 UTC