20e241bd03
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Self-collapsing elements (zero height, no padding/border, no BFC, no line boxes) now have their top and bottom margins collapse together, and child margins propagate through parents with auto height and no bottom padding/border. This replaces the pairwise collapse_margins() function with a MarginSet accumulator that tracks max positive and min negative margins separately, correctly resolving chains of 4+ margins. Key changes: - Add is_self_collapsing() post-layout predicate and gather_all_margins() - Add gather_margin_bottom() for bottom margin propagation with a guard against propagation when max-height constrains the parent - Replace prev_margin_bottom with MarginSet-based pending_margins in the sibling layout loop - Handle clearance + self-collapsing interaction correctly Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
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content: (0, 0, 800, 102.4)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 0 0 0 0
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LayoutBox node=#10 tag=body box=block
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content: (0, 0, 800, 86.4)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 0 0 0 0
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LayoutBox node=#12 tag=p box=block
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content: (0, 16, 800, 19.2)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 16 0 16 0
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inline_context: 1 lines, height=19.2, max_width=34.713654
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line[0]: rect=(0, 16, 34.713654, 19.2) fragments=1
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LayoutBox node=#13 tag=anonymous box=anon
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content: (0, 0, 34.713654, 16)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 0 0 0 0
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text: "match"
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LayoutBox node=#15 tag=p box=block
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content: (0, 51.2, 800, 19.2)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 16 0 16 0
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LayoutBox node=#16 tag=anonymous box=anon
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content: (0, 0, 52.863434, 16)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 0 0 0 0
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text: "no-match"
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