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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 -moz-column-rule position</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/" /> <!-- 2013-08-09 -->
+ <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." />
+<style type="text/css"><![CDATA[
+@font-face {
+ font-family: Ahem;
+ src: url("../../../fonts/Ahem.ttf");
+}
+]]></style>
+ <style type="text/css"><![CDATA[
+ body > div
+ {
+ -moz-column-rule: blue solid 1em;
+ font: 1.25em/1 Ahem;
+ width: 42em;
+ }
+
+ /*
+
+ N == 3;
+
+ W == max(0, (available-width - ((N - 1) * -moz-column-gap)) / N);
+ W == max(0, (42em - ((3 - 1) * 3em)) / 3);
+ W == max(0, (42em - (2 * 3em)) / 3);
+ W == max(0, (42em - 6em) / 3);
+ W == max(0, 36em / 3);
+ W == max(0, 12em);
+ W == 12em;
+
+ So, the first -moz-column-rule should be at:
+
+ 1.0em : margin-left of outer div
+ 12.0em : width of 1st column box
+ 1.0em : (3.0em / 2) - (1.0em / 2) : left edge of 1st -moz-column-rule
+ =========
+ 14.0em
+
+ The 2nd -moz-column-rule should be at:
+
+ 1.0em : margin-left of outer div
+ 12.0em : width of 1st column box
+ 3.0em : first -moz-column-gap
+ 12.0em : width of 2nd column box
+ 1.0em : (3.0em / 2) - (1.0em / 2) : left edge of 2nd -moz-column-rule
+ =========
+ 29.0em
+
+ 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:
+
+ 12em : width of each outer column box
+ -
+ 2em : horizontal margin of each div inside
+ =======
+ 10em : width of each inner multi-column elements
+
+ N == 3;
+
+ W == max(0, (available-width - ((N - 1) * -moz-column-gap)) / N);
+ W == max(0, (10em - ((3 - 1) * 3em)) / 3);
+ W == max(0, (10em - (2 * 3em)) / 3);
+ W == max(0, (10em - 6em) / 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;
+
+ -moz-column-count: 3;
+ -moz-column-gap: 3em;
+ }
+ ]]></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>