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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 Multi-column Layout Test: nested multicolumn and nested margin-top</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/" /> <!-- 2013-08-14 -->
<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-nested-margin-004-ref.xht" />
<meta name="flags" content="ahem" />
<meta name="assert" content="This test checks that due to a top margin only set on the first child element of a nested multicol element that will not collapse with the margins of the multicol element, then the height of an multi-column element can make its other inner multi-column (with a zero margin-top) element break into its own column boxes." />
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style type="text/css"><![CDATA[
body > div
{
font: 1.25em/1 Ahem;
margin: 1em;
width: 41em;
/*
This test requires a viewport width of 860px
*/
}
div
{
background: yellow;
color: black;
margin: 1em;
orphans: 1;
widows: 1;
column-count: 3;
column-gap: 1em;
}
div div {margin: 0 1em;}
div div:first-child {margin: 1em 1em 0;}
/*
N == 3;
43em - 2em (horizontal margins) == available-width
W == max(0, (available-width - ((N - 1) * column-gap)) / N);
W == max(0, (41em - ((3 - 1) * 1em)) / 3);
W == max(0, (41em - (2 * 1em)) / 3);
W == max(0, (41em - 2em) / 3);
W == max(0, 39em / 3);
W == max(0, 13em);
W == 13em;
13em : width of each outer column box
-
2em : horizontal margin of each div inside
=======
11em : width of each inner multi-column elements
N == 3;
W == max(0, (available-width - ((N - 1) * column-gap)) / N);
W == max(0, (11em - ((3 - 1) * 1em)) / 3);
W == max(0, (11em - (2 * 1em)) / 3);
W == max(0, (11em - 2em) / 3);
W == max(0, 9em / 3);
W == max(0, 3em);
W == 3em;
*/
div div:nth-child(2) {color: pink;}
div div:nth-child(3) {color: blue;}
]]></style>
</head>
<body>
<div>
<div>
bl ac
bl ac
bl ac
bl ac
</div>
<div>
Pi nk
Pi nk
Pi nk
Pi nk
</div>
<div>
bl ue
bl ue
bl ue
bl ue
</div>
</div>
</body>
</html>
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