Ignore auto margins for sticky positioning
Categories
(Core :: Layout: Positioned, defect)
Tracking
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People
(Reporter: dholbert, Unassigned)
References
(Blocks 1 open bug)
Details
One sub-issue that was raised in https://github.com/w3c/csswg-drafts/issues/9052 : currently we honor auto margins as reducing the size of the sticky constraint box in sticky-positioning, but other browsers do not. We are technically correct per-spec, but it's a bit unhelpful since it effectively opts the element out of sticky positioning entirely (by reducing the sticky constraint box by all of the available space between the containing block edges and the element).
The CSSWG tentatively resolved to remove margins altogether from sticky positioning considerations, per bug 1844435, but while we wait to find out if that's web-compatible, we might want to take the intermediate step of not-honoring-auto-margins for interop & apparent CSSWG consensus based on the discussion.
Description
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