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multicol-nested-column-rule-001.xht
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multicol-nested-column-rule-001.xht
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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>
<!--
This test's original filename was multicol-inherit-004.xht
and it has been modified and is now
multicol-nested-column-rule-001.xht
-->
<title>CSS Multi-column Layout Test: nested multi-columns and column-rule position</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/" /> <!-- 2013-08-09 -->
<link rel="help" href="http://www.w3.org/TR/css3-multicol/#pseudo-algorithm" title="3.4 Pseudo-algorithm" />
<link rel="match" href="multicol-nested-column-rule-001-ref.xht" />
<meta name="flags" content="ahem" />
<meta name="assert" content="This test checks how the height of column boxes conditions the height of column rule." />
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style type="text/css"><![CDATA[
body > div
{
column-rule: blue solid 1em;
font: 1.25em/1 Ahem;
width: 26em;
}
/*
N == 3;
W == max(0, (available-width - ((N - 1) * column-gap)) / N);
W == max(0, (26em - ((3 - 1) * 1em)) / 3);
W == max(0, (26em - (2 * 1em)) / 3);
W == max(0, (26em - 2em) / 3);
W == max(0, 24em / 3);
W == max(0, 8em);
W == 8em;
So, the first column-rule should be at:
1.0em : margin-left of outer div
8.0em : width of 1st column box
0.0em : (1.0em / 2) - (1.0em / 2) : left edge of 1st column-rule
=========
9.0em
The 2nd column-rule should be at:
1.0em : margin-left of outer div
8.0em : width of 1st column box
1.0em : first column-gap
8.0em : width of 2nd column box
0.0em : (1.0em / 2) - (1.0em / 2) : left edge of 2nd column-rule
=========
18.0em
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:
8em : width of each outer column box
-
2em : horizontal margin of each div inside
=======
6em : width of each inner multi-column elements
N == 3;
W == max(0, (available-width - ((N - 1) * -column-gap)) / N);
W == max(0, (6em - ((3 - 1) * 1em)) / 3);
W == max(0, (6em - (2 * 1em)) / 3);
W == max(0, (6em - 2em) / 3);
W == max(0, 4em / 3);
W == max(0, 1.33333em);
W == 1.33333em;
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: white;
color: white;
font-size: 1em;
margin: 0em 1em;
orphans: 1;
widows: 1;
column-count: 3;
column-gap: 1em;
}
]]></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>