Proposal to extend WebVTT CSS extensions to WebVMT

I've recently drafted a proposal [1] for extending WebVTT CSS extensions [2] to WebVMT [3] and would appreciate guidance from the CSS WG on how best to refine this. I attended the CSS TPAC breakout [4] on 18 October 2021 and was advised to raise my query through this mailing list.

I’ve created a github issue in the WebVMT CG repo [1] and await your constructive feedback with interest. Thanks.

Rob Smith
WebVMT Editor [3]

[1] https://github.com/webvmt/community-group/issues/7 <https://github.com/webvmt/community-group/issues/7>
[2] https://www.w3.org/TR/webvtt1/#css-extensions <https://www.w3.org/TR/webvtt1/#css-extensions>
[3] https://w3c.github.io/sdw/proposals/geotagging/webvmt/ <https://w3c.github.io/sdw/proposals/geotagging/webvmt/>
[4] https://www.w3.org/2021/10/18-stateofcss-minutes.html <https://www.w3.org/2021/10/18-stateofcss-minutes.html>