[ttml2] Remove @condition from animation, layout, and styling elements.

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

== Remove @condition from animation, layout, and styling elements. ==
At present, the ``@condition`` attribute can apply conditionalization to the grouping elements ``animation``, ``layout``, and ``styling``. However, only one of each of these grouping elements are permitted in ``head``, and, consequently, a false condition on any of these would, respectively, remove all out-of-line animations, all out-of-line regions, and all referential styling as a whole.

I am at a loss to find any concrete use case for such conditionalization scenarios to offset the complexity of supporting ``@condition`` in these contexts. Therefore, I propose we drop ``@condition`` from these three element types.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/704 using your GitHub account

Received on Wednesday, 28 March 2018 02:06:40 UTC