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>
51 lines
1.1 KiB
HTML
51 lines
1.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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.root {
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position: relative;
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width: 300px;
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height: 200px;
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background-color: lightgray;
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z-index: 0;
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}
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.level1 {
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position: absolute;
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top: 10px;
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left: 10px;
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width: 200px;
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height: 150px;
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background-color: red;
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z-index: 1;
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}
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.level2 {
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position: absolute;
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top: 10px;
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left: 10px;
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width: 150px;
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height: 100px;
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background-color: green;
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z-index: 2;
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}
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.level3 {
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position: absolute;
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top: 10px;
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left: 10px;
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width: 100px;
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height: 60px;
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background-color: blue;
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z-index: 3;
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}
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</style>
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</head>
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<body>
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<div class="root">
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<div class="level1">L1
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<div class="level2">L2
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<div class="level3">L3</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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