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>
29 lines
1.1 KiB
Plaintext
29 lines
1.1 KiB
Plaintext
LayoutBox node=#1 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=#9 tag=body box=block
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content: (8, 8, 784, 49.2)
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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: (23, 23, 754, 19.2)
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padding: 5 5 5 5
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border: 0 0 0 0
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margin: 10 10 10 10
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inline_context: 1 lines, height=19.2, max_width=163.73569
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line[0]: rect=(23, 23, 163.73569, 19.2) fragments=5
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frag[0]: rect=(23, 24.6, 20.957415, 16) text="Box" start=false end=false
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frag[1]: rect=(47.011745, 24.6, 23.765053, 16) text="with" start=false end=false
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frag[2]: rect=(73.83112, 24.6, 39.94126, 16) text="margin" start=false end=false
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frag[3]: rect=(116.82671, 24.6, 21.07489, 16) text="and" start=false end=false
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frag[4]: rect=(140.95595, 24.6, 45.779736, 16) text="padding" start=false end=false
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LayoutBox node=#12 tag=anonymous box=anon
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content: (0, 0, 163.73569, 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: "Box with margin and ..."
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