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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>CSS Test: Margin collapsing - parent edge and element edge are the same when margins collapse</title>
<link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
<link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-08-15 -->
<link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" />
<link rel="match" href="margin-collapse-017-ref.xht" />
<meta name="assert" content="When the top margin of a child box collapses with the top margin of its parent, then the margin-top edge of such child box is the same as the parent's and their respective content should be 'sitting' at the parent's border-bottom (in the testcase, the black line) assuming the same height value and the same padding-bottom value for the parent and its child box." />
<style type="text/css">
#div1
{
border-bottom: black solid 3px;
}
div div
{
height: 20px;
margin-top: 60px;
width: 60px;
}
#div2
{
background: red;
}
#div3
{
background: blue;
}
</style>
</head>
<body>
<p>Test passes if the blue stripe is touching the line and there is <strong>no red</strong>.</p>
<div id="div1">
<div id="div2">
<div id="div3"></div>
</div>
</div>
</body>
</html>
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