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
1.2 KiB
HTML
51 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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.container {
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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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/* Parent has z-index:1. Child z-index:999 must NOT paint above sibling z-index:2 */
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.parent-low {
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position: absolute;
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top: 10px;
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left: 10px;
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width: 120px;
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height: 120px;
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background-color: red;
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z-index: 1;
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}
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.child-high {
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position: absolute;
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top: 10px;
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left: 10px;
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width: 80px;
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height: 80px;
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background-color: orange;
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z-index: 999;
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}
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.sibling-mid {
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position: absolute;
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top: 50px;
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left: 50px;
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width: 120px;
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height: 120px;
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background-color: blue;
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z-index: 2;
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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="container">
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<div class="parent-low">
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<div class="child-high">High</div>
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</div>
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<div class="sibling-mid">Mid</div>
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</div>
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</body>
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</html>
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