Re: [csswg-drafts] [css-conditional] [css-contain] `cw` and `ch` units (#5888)

`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.

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Received on Monday, 25 January 2021 09:31:15 UTC