For block containers specifically, margin-trim discards: - The block-start margin of a block-level first child, when trimming at the block-start edge. - The block-end margin of a block-level last child, when trimming at the block-end edge. - Any margin collapsed with these margins. https://w3c.github.io/csswg-drafts/css-box-4/#margin-trim-block
<rdar://problem/103285722>
Pull request: https://github.com/WebKit/WebKit/pull/7882
Committed 258457@main (6bd29f7cff74): <https://commits.webkit.org/258457@main> Reviewed commits have been landed. Closing PR #7882 and removing active labels.