[css-inline-3] [css-box-4] Clarify trimming on nagative values - #14331
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[css-inline-3] [css-box-4] Clarify trimming on nagative values#14331jakearchibald wants to merge 2 commits into
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Covers the clarification in w3c/csswg-drafts#14331 that margin-trim truncates margins adjacent to the trimmed edges to zero whether they are positive or negative, including descendant margins collapsed with them. See w3c/csswg-drafts#14328
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Covers the clarification in w3c/csswg-drafts#14331 that negative half-leading is trimmed as well as positive: when the specified text-box-edge metric falls outside the corresponding edge of the line box, the content edge moves outward to match it, increasing the logical height of the box. See w3c/csswg-drafts#14328
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Fixes #14328