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[css-sizing-4] Clarify transfer (or non-transfer) of indefinite sizes through aspect-ratio #5306

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fantasai opened this issue Jul 9, 2020 · 3 comments
Open

[css-sizing-4] Clarify transfer (or non-transfer) of indefinite sizes through aspect-ratio #5306

fantasai opened this issue Jul 9, 2020 · 3 comments
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css-sizing-4

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@fantasai
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fantasai commented Jul 9, 2020

Current spec specifies that definite sizes are transferred through the aspect ratio. But there are probably some cases where "indefinite" sizes need to also be transferred, e.g. replaced elements with an intrinsic size must always be able to transfer those sizes.

(Probably for non-replaced elements, such sizes shouldn't transfer, since in many cases they will require layout. This rationale should also be noted in the spec so it's clear.)
@tabatkins
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This is a corner case, but yeah, it is possible to have an SVG with an intrinsic width and nothing else. In this situation, setting 'aspect-ratio: 1 / 1;' should probably transfer the intrinsic width across to become an intrinsic height as well.

@fantasai
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I wonder if we should define fixed-length intrinsic sizes of replaced elements as definite?

tabatkins added a commit that referenced this issue Jul 20, 2020
@tabatkins
[css-sizing-4] Specify that a-r can change a replaced element with a …
74ccde2 
…single intrinsic dimension into a full suite of 3. #5306
@tabatkins
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I'm a little scared of doing that; I don't have any example, but I suspect it might have unexpected effects on layout algorithms. The above commit at least gives us the minimal edit to solve this issue, tho.

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