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rust_browser/tests/goldens/expected/140-mixed-font-styles.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, 75.2)
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, 51.2)
padding: 0 0 0 0
border: 0 0 0 0
margin: 8 8 8 8
LayoutBox node=#4 tag=p box=block
content: (8, 24, 784, 19.2)
padding: 0 0 0 0
border: 0 0 0 0
margin: 16 0 16 0
inline_context: 1 lines, height=19.2, max_width=200.35243
line[0]: rect=(8, 24, 200.35243, 19.2) fragments=5
frag[0]: rect=(8, 25.6, 41.491924, 16) text="Normal" start=false end=false
frag[1]: rect=(52.546257, 25.6, 25.69163, 16) text="bold" start=true end=true
frag[2]: rect=(81.29221, 25.6, 24.986786, 16) text="italic" start=true end=true
frag[3]: rect=(109.33333, 25.6, 56.14097, 16) text="bold-italic" start=true end=true
frag[4]: rect=(168.52864, 25.6, 39.823788, 16) text="normal" start=false end=false
LayoutBox node=#5 tag=anonymous box=anon
content: (0, 0, 44.546257, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "Normal "
LayoutBox node=#6 tag=b box=inline
content: (0, 0, 0, 0)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
LayoutBox node=#7 tag=anonymous box=anon
content: (0, 0, 25.69163, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "bold"
LayoutBox node=#8 tag=anonymous box=anon
content: (0, 0, 3.0543318, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: " "
LayoutBox node=#9 tag=em box=inline
content: (0, 0, 0, 0)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
LayoutBox node=#10 tag=anonymous box=anon
content: (0, 0, 24.986786, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "italic"
LayoutBox node=#11 tag=anonymous box=anon
content: (0, 0, 3.0543318, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: " "
LayoutBox node=#12 tag=b box=inline
content: (0, 0, 0, 0)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
LayoutBox node=#13 tag=em box=inline
content: (0, 0, 0, 0)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
LayoutBox node=#14 tag=anonymous box=anon
content: (0, 0, 56.14097, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "bold-italic"
LayoutBox node=#15 tag=anonymous box=anon
content: (0, 0, 42.87812, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: " normal"