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>
27 lines
1002 B
Plaintext
27 lines
1002 B
Plaintext
LayoutBox node=#2 tag=html box=block
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content: (0, 0, 800, 110.72001)
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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: (8, 8, 784, 81.28001)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 8 8 8 8
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LayoutBox node=#12 tag=h1 box=block
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content: (8, 29.44, 784, 38.4)
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padding: 0 0 0 0
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border: 0 0 0 0
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margin: 21.44 0 21.44 0
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inline_context: 1 lines, height=38.4, max_width=214.76651
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line[0]: rect=(8, 29.44, 214.76651, 38.4) fragments=3
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frag[0]: rect=(8, 32.64, 64.56387, 32) text="Some" start=false end=false
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frag[1]: rect=(78.67254, 32.64, 46.214394, 32) text="test" start=false end=false
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frag[2]: rect=(130.99559, 32.64, 91.77093, 32) text="content" start=false end=false
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LayoutBox node=#13 tag=anonymous box=anon
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content: (0, 0, 214.76648, 32)
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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: "Some test content"
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