Zachary D. Rowitsch 90063566d4 Clamp auto-height to zero when negative margins produce negative content height ...

CSS 2.1 §10.6.3 defines auto-height as the distance from the content top
to the last in-flow child's margin-box bottom. Large negative margins can
make this negative, which has no geometric meaning. Clamp to 0 to match
browser behavior and fix Acid2 .empty div layout.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-28 04:37:25 -05:00

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