53dd6646b2
Root element now creates a stacking context unconditionally. Refactored display list builder to correctly bucket stacking participants into three groups (negative/zero/positive z-index) per Appendix E steps 2/6/7. Fixed z-index:0 elements painting at step 7 instead of step 6, and descendant stacking contexts being trapped inside positioned z-index:auto ancestors instead of participating in the parent stacking context. Added StackingBuckets struct, unified step-6 rendering with tree-order merge by node_id, and 7 unit tests for creates_stacking_context(). Added 6 golden tests (213-218) and 4 integration tests asserting paint-order invariants programmatically. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
9 lines
424 B
Plaintext
9 lines
424 B
Plaintext
DisplayList items=7
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SolidRect rect=(8, 8, 200, 150) color=#d3d3d3
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SolidRect rect=(8, 8, 80, 40) color=#ff0000
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Text rect=(8, 9.6, 7.506608, 16) text="A" color=#000000 font_size=16
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SolidRect rect=(8, 48, 80, 40) color=#0000ff
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Text rect=(8, 49.6, 7.6358294, 16) text="B" color=#000000 font_size=16
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SolidRect rect=(8, 88, 80, 40) color=#008000
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Text rect=(8, 89.6, 7.424376, 16) text="C" color=#000000 font_size=16
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