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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="GĂ©rard 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>