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>
26 lines
888 B
Plaintext
26 lines
888 B
Plaintext
LayoutBox node=#2 tag=html box=block
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content: (0, 0, 800, 67.2)
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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, 51.2)
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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, 200, 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=55.90602
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line[0]: rect=(72.04699, 16, 55.90602, 19.2) fragments=2
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frag[0]: rect=(72.04699, 17.6, 35.24229, 16) text="center" start=false end=false
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frag[1]: rect=(110.34361, 17.6, 17.609398, 16) text="me" start=false end=false
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LayoutBox node=#13 tag=anonymous box=anon
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content: (0, 0, 55.90602, 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: "center me"
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