`rw` and `rh` would match the identically named [`<length>`](https://www.w3.org/TR/ttml2/#style-value-length) units in TTML2, in the case that the container is the _root container region_, which makes sense e.g. for playing captions over a video container, where it is normal to render text at a height proportional the height of the video. -- GitHub Notification of comment by nigelmegitt Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5888#issuecomment-766681306 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Monday, 25 January 2021 09:31:15 UTC
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