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rust_browser/tests/goldens/expected/156-nested-lists.layout.txt
Zachary D. Rowitsch 20e241bd03
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Implement margin collapsing through empty elements (CSS 2.1 §8.3.1)
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>
2026-03-01 01:04:53 -05:00

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LayoutBox node=#1 tag=html box=block
content: (0, 0, 800, 180.8)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
LayoutBox node=#2 tag=body box=block
content: (8, 8, 784, 156.8)
padding: 0 0 0 0
border: 0 0 0 0
margin: 8 8 8 8
LayoutBox node=#3 tag=ul box=block
content: (48, 24, 744, 124.8)
padding: 0 0 0 40
border: 0 0 0 0
margin: 16 0 16 0
LayoutBox node=#5 tag=li box=block
content: (48, 24, 744, 89.600006)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
marker: "•"
LayoutBox node=#6 tag=(anonymous-block) box=block
content: (48, 24, 744, 19.2)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
inline_context: 1 lines, height=19.2, max_width=28.534508
line[0]: rect=(48, 24, 28.534508, 19.2) fragments=1
frag[0]: rect=(48, 25.6, 25.480175, 16) text="Fruit" start=false end=false
LayoutBox node=#6 tag=anonymous box=anon
content: (0, 0, 28.534508, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "Fruit "
LayoutBox node=#7 tag=ol box=block
content: (88, 59.2, 704, 38.400005)
padding: 0 0 0 40
border: 0 0 0 0
margin: 16 0 16 0
LayoutBox node=#9 tag=li box=block
content: (88, 59.2, 704, 19.2)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
marker: "1."
inline_context: 1 lines, height=19.2, max_width=31.612335
line[0]: rect=(88, 59.2, 31.612335, 19.2) fragments=1
frag[0]: rect=(88, 60.800003, 31.612337, 16) text="Apple" start=false end=false
LayoutBox node=#10 tag=anonymous box=anon
content: (0, 0, 31.612337, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "Apple"
LayoutBox node=#12 tag=li box=block
content: (88, 78.4, 704, 19.200005)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
marker: "2."
inline_context: 1 lines, height=19.200005, max_width=41.926575
line[0]: rect=(88, 78.4, 41.926575, 19.2) fragments=1
frag[0]: rect=(88, 80, 41.92658, 16) text="Banana" start=false end=false
LayoutBox node=#13 tag=anonymous box=anon
content: (0, 0, 41.92658, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "Banana"
LayoutBox node=#17 tag=li box=block
content: (48, 129.6, 744, 19.199997)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
marker: "•"
inline_context: 1 lines, height=19.199997, max_width=55.23642
line[0]: rect=(48, 129.6, 55.23642, 19.2) fragments=1
frag[0]: rect=(48, 131.20001, 55.236416, 16) text="Vegetable" start=false end=false
LayoutBox node=#18 tag=anonymous box=anon
content: (0, 0, 55.236416, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "Vegetable"