multicol-collapsing-001.xht
<!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 Multi-column Layout Test: no margin collapsing with its first child block box</title>
<link rel="author" title="Opera Software ASA" href="http://www.opera.com/" />
<link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2013-07-25 -->
<link rel="help" href="http://www.w3.org/TR/css3-multicol/#the-multi-column-model" title="2. The multi-column model" />
<link rel="match" href="multicol-collapsing-001-ref.xht"/>
<meta name="flags" content="ahem" />
<meta name="assert" content="This test checks that the top margin of the first child block box of a multicol element does not collapse with the margin top of such multicol element." />
<style type="text/css"><![CDATA[
body > div
{
background-color: black;
border: black solid 1px;
font: 1.25em/1 Ahem;
width: 10em;
}
div > div
{
background-color: yellow;
color: black;
margin: 1em;
width: 8em;
orphans: 1;
widows: 1;
column-count: 3;
column-gap: 1em;
}
h4
{
font: inherit;
margin: 1em 0 0;
}
]]></style>
</head>
<body>
<div>
<div>
<h4>ab cd</h4>
ef gh
ij kl
mn oq
</div>
</div>
</body>
</html>