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<!DOCTYPE html>
<html><head><meta charset="utf-8">
<title>CSS Basic User Interface Test: box-sizing:padding-box and CSS2.1 10.3.3</title>
<link href="http://florian.rivoal.net/" rel="author" title="Florian Rivoal">
<link href="https://drafts.csswg.org/css-ui-3/#box-sizing" rel="help">
<link href="http://www.w3.org/TR/CSS21/visudet.html#blockwidth" rel="help">
<meta content="" name="flags">
<link href="reference/box-sizing-001-ref.htm" rel="match">
<meta content="When box-sizing is padding-box, the content width, rather than the computed value of the width property,
is considered when checking whether a block is larger than its containing block." name="assert">
<style>
#cb {
position: absolute;
width: 100px;
height: 100px;
}
#red {
position:absolute;
top: 25px;
right:5px;
width: 70px;
height: 70px;
background:red;
z-index: -1;
}
#test {
box-sizing: padding-box;
margin-top: 25px;
margin-right: 5px;
margin-left: auto; /* should resolve to 25px, but would resolve to 0 if the wrong interpretation of width is used in CSS2.1 10.3.3 */
padding-left: 25px;
padding-right: 25px;
width: 70px;
height: 70px;
background:green;
}
</style>
</head><body>
<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
<div id="cb">
<div id="red"></div>
<div id="test"></div>
</div>
</body></html>
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