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[css-align] Auto margins aren't just treated as zero #11230

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Loirooriol opened this issue Nov 18, 2024 · 0 comments

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Loirooriol commented Nov 18, 2024

https://drafts.csswg.org/css-align/#justify-abspos

For replaced absolutely-positioned boxes, the normal keyword behaves as start.

For all other absolutely-positioned boxes, normal behaves as stretch. Additionally, if neither inset in this axis is auto, but width (height, for vertical writing modes) is auto, auto margins are treated as zero.

(In non-normal cases, auto margins are prioritized over the self-alignment properties, as usual.)

Treating auto margins as zero is not the same as de-prioritizing them, as seen here:

<!DOCTYPE html>
<style>
.wrapper { position: relative; width: 50px; height: 50px; border: 3px solid; }
.abspos { position: absolute; inset: 0; place-self: normal; max-width: 25px; max-height: 25px; background: cyan }
</style>
<div class="wrapper"><div class="abspos" style="margin: auto"></div></div>
<div class="wrapper"><div class="abspos" style="margin: 0px"></div></div>

Spec	Blink Gecko WebKit Servo

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Loirooriol added the css-align-3 label

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