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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 multi-columns and constrained dimensions</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/" /> <!-- 2013-08-10 -->
<link rel="help" href="http://www.w3.org/TR/css3-multicol/#pseudo-algorithm" title="3.4 Pseudo-algorithm" />
<link rel="match" href="multicol-nested-005-ref.xht" />
<!--
The original filename of this test was
multicol-inherit-005.xht
This test also serves as a conversion of
multicol-nested-001.xht
-->
<meta name="flags" content="ahem" />
<meta name="assert" content="This test checks how the height of column boxes conditions the height of nested column boxes." />
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style type="text/css"><![CDATA[
body > div
{
column-gap: 1em;
font: 1.25em/1 Ahem;
width: 41em;
}
/*
N == 3;
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;
The height of column rule depends on number of line boxes in
each outer column box which depends on number of line boxes
in each inner column box. So:
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;
So, each duo of 'a', 'm' and 'x' should fill one and only 1 line
box. There are 8 duos; therefore, the first 2 inner
column boxes should use 3 line boxes and the 3rd inner
column box should be using 2 line boxes.
So, the height of the 2 blue column rules should be 60px.
*/
div
{
background-color: yellow;
color: black;
font-size: 1em;
margin: 1em;
orphans: 1;
widows: 1;
column-count: 3;
}
div > div:first-child {margin-top: 0;}
]]></style>
</head>
<body>
<div>
<div>
aa aa
aa aa
aa aa
aa aa
</div>
<div>
mm mm
mm mm
mm mm
mm mm
</div>
<div>
xx xx
xx xx
xx xx
xx xx
</div>
</div>
</body>
</html>
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