[csswg-drafts] [css-sizing] "behaves as auto" needs clarifications (#13652)

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

== [css-sizing] "behaves as auto" needs clarifications ==
https://drafts.csswg.org/css-sizing-3/#behave-as-auto

This section needs some wording tweaks to make it clearer that we're not equating this with computing to `auto`, and also the note should probably clarify that these uses are largely around sizing and don't affect margin collapsing (which should continue to check the computed style, [testcase](https://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E%0A%3Cdiv%20style%3D%22margin%3A%202em%200%3B%20height%3A%20100%25%22%3E%0A%3Cdiv%20style%3D%22margin%3A%202em%200%22%3EInside%3C%2Fdiv%3E%0A%3C%2Fdiv%3E%0AEnd)).

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/13652 using your GitHub account


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Received on Friday, 13 March 2026 18:00:14 UTC