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>
25 lines
778 B
Plaintext
25 lines
778 B
Plaintext
LayoutBox node=#1 tag=html box=block
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content: (0, 0, 800, 8)
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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=#9 tag=body box=block
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content: (8, 8, 784, 0)
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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=#11 tag=div box=block
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content: (20, 10, 100, 30)
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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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inline_context: 1 lines, height=19.2, max_width=29.192364
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line[0]: rect=(20, 10, 29.192364, 19.2) fragments=1
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frag[0]: rect=(20, 11.6, 29.192364, 16) text="Fixed" start=false end=false
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LayoutBox node=#12 tag=anonymous box=anon
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content: (0, 0, 29.192364, 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: "Fixed"
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