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layout: Implement opacity
per CSS-COLOR § 3.2.
This adds the infrastructure necessary to support stacking contexts that are not containing blocks for absolutely-positioned elements. Our infrastructure did not support that before. This minor revamp actually ended up simplifying the logic around display list building and stacking-relative position computation for absolutely-positioned flows, which was nice.
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17 changed files with 421 additions and 146 deletions
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tests/ref/opacity_simple_ref.html
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tests/ref/opacity_simple_ref.html
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<!DOCTYPE html>
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<html>
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<head>
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<!-- Tests that opacity works. -->
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<style>
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section {
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position: absolute;
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width: 100px;
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height: 100px;
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top: 50px;
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left: 50px;
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background: #200060;
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}
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</style>
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</head>
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<body>
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<section></section>
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</body>
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</html>
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