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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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48
tests/ref/opacity_stacking_context_ref.html Normal file
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<!DOCTYPE html>
<html>
<head>
<!-- Tests that `opacity` causes a new stacking context to be formed. -->
<style>
section {
position: absolute;
width: 100px;
height: 100px;
}
#a {
background: red;
top: 0;
left: 0;
z-index: 2;
}
#b {
background: #00ff00;
top: 25px;
left: 25px;
z-index: 1;
opacity: 0.5;
}
#c {
background: blue;
top: 50px;
left: 50px;
z-index: 3;
}
#container {
width: 200px;
height: 200px;
}
</style>
</head>
<body>
<section id=a></section>
<section id=c></section>
<div id=container>
<section id=b></section>
</div>
</body>
</html>