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[csswg-drafts] Pull Request: [css-contain-2] Clarify how sizing containment works

From: Florian Rivoal via GitHub <sysbot+gh@w3.org>
Date: Wed, 21 Oct 2020 10:31:32 +0000
To: public-css-archive@w3.org
Message-ID: <pull_request.labeled-507429664-None-sysbot+gh@w3.org>
frivoal has just labeled a pull request from frivoal for https://github.com/w3c/csswg-drafts as "css-contain-1":

== [css-contain-2] Clarify how sizing containment works ==
This is not meant to change the expected behavior, however the original text was not very clearly phrased, hence this rewrite.

This is an attempt to solve #4931, along the lines of the so-called option α of https://github.com/w3c/csswg-drafts/issues/4931#issuecomment-704676915. It is currently written against level 2, but to be back ported to the L1 REC if we like it.

The diff is reasonably hard to read, so for ease of review, here's the resulting new section 3.1: https://lists.w3.org/Archives/Public/www-archive/2020Oct/att-0005/Overview.html#containment-size

Also note the commented out line in the source, which would allow us to let other specs opt into excluding some properties from the *sizing as if empty* phase, in order to do the so-called option β of https://github.com/w3c/csswg-drafts/issues/4931#issuecomment-704676915

See https://github.com/w3c/csswg-drafts/pull/5643

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