[csswg-drafts] [css-content] Add new 'content' value that suppress boxes for child elements (formerly known as 'content:none' for elements) (#6511)

MatsPalmgren has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-content] Add new 'content' value that suppress boxes for child elements (formerly known as 'content:none' for elements) ==
Follow-up from #6503 which removed `content:none` for elements, since it wasn't web-compatible.

I would like a resolution (soon please) on whether to retain that functionality under a different keyword, e.g. `children-none`, `empty` or whatever.

CC @emilio 

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6511 using your GitHub account


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