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layout: Implement opacity per CSS-COLOR § 3.2.

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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.
This commit is contained in:
Patrick Walton 2014-11-18 15:37:53 -08:00
parent 873ca6cadd
commit 1c1c507c03
17 changed files with 421 additions and 146 deletions
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27
tests/ref/opacity_simple_a.html Normal file
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<!DOCTYPE html>
<html>
<head>
<!-- Tests that opacity works. -->
<style>
section {
position: absolute;
width: 100px;
height: 100px;
top: 50px;
left: 50px;
}
#a {
background: #800000;
}
#b {
background: #000080;
opacity: 0.75;
}
</style>
</head>
<body>
<section id=a></section>
<section id=b></section>
</body>
</html>