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Re: [csswg-drafts] [css-grid] Replaced elements canvas, img, etc should behave as expected when styled with relative sizes in grid, transferred size should not affect them unless specifically asked to (#6278)

From: Ian Kilpatrick via GitHub <sysbot+gh@w3.org>
Date: Sat, 24 Jul 2021 22:29:08 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-886118434-1627165746-sysbot+gh@w3.org>
Firefox doesn't implement the 2nd pass for this case correctly which is why it has its particular behaviour, in addition the engine currently doesn't correctly perform the transferred size suggestion more generally. (Lots of ways to trigger this, e.g. https://www.software.hixie.ch/utilities/js/live-dom-viewer/?saved=9508 )

The best way out of this I believe is to add another exception to:
https://drafts.csswg.org/css-grid-1/#min-size-auto

"To provide a more reasonable default minimum size for grid items, the used value of its automatic minimum size in a given axis is the content-based minimum size if all of the following are true:"

And add something like:
"It is not - a replaced element with a preferred aspect-ratio and its main-size in the relevant axis being a <percentage>". (or potentially just a "an element with a preferred aspect-ratio").

I don't think changing the %-resolution size when determining the automatic minimum size is the correct solution here.

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Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6278#issuecomment-886118434 using your GitHub account


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