0863153acd
Add parent-first-child top and parent-last-child bottom margin collapsing using a two-level approach (Level A shifts child inside parent, Level B adjusts grandparent for effective collapsed margin). Fix pre-existing bug in shift_subtree_x that incorrectly skipped absolute/fixed children. Extract shared MARGIN_EPSILON constant, add 9 unit tests and 4 golden tests (209-212), promote 31 WPT tests to pass. Includes code review fixes: pub(crate) visibility for is_root_element, known-limitation docs, and inline-content shift test coverage. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
17 lines
407 B
HTML
17 lines
407 B
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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body { margin: 0; }
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.before { height: 10px; margin-bottom: 20px; background: lightblue; }
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.min-h { min-height: 10px; margin-top: 15px; margin-bottom: 25px; background: lightgreen; }
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.after { height: 10px; margin-top: 10px; background: lightyellow; }
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</style>
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</head>
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<body>
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<div class="before"></div>
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<div class="min-h"></div>
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<div class="after"></div>
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</body>
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</html>
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