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Re: [csswg-drafts] [css-sizing-4][css-contain] Clarify on specifying aspect-ratio and contain:size on replaced elements (#5550)

From: Tab Atkins Jr. via GitHub <sysbot+gh@w3.org>
Date: Thu, 01 Oct 2020 20:27:58 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-702378782-1601584077-sysbot+gh@w3.org>
Yes, `contain:size` censors the intrinsic aspect ratio, but an explicit 'aspect-ratio' value will still give the element an aspect ratio. So the element in the OP's example should be 100x100.

There's a related question of how the `width`/`height` attributes on an `img` are interpreted; I think the most reasonable and consistent answer is that their ratio is mapped to 'aspect-ratio' as a presentational hint (same as `width`/`height` are mapped to 'width'/'height', and so it's respected even when `contain:size` is specified.

This isn't correct per-spec right now, but <https://github.com/whatwg/html/issues/5907> has been filed to fix this.

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