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abs-pos-non-replaced-vlr-087.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>
<title>CSS Writing Modes Test: absolutely positioned non-replaced element - 'direction: ltr' and 'top', 'height' and 'bottom' are not 'auto' (overconstrained)</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
<link rel="help" href="http://www.w3.org/TR/css-writing-modes-3/#vertical-layout" title="7.1 Principles of Layout in Vertical Writing Modes" />
<link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width" title="10.3.7 Absolutely positioned, non-replaced elements" />
<link rel="match" href="abs-pos-non-replaced-vlr-003-ref.xht" />
<meta name="flags" content="ahem image" />
<meta name="assert" content="When 'direction' is 'ltr' and 'top', 'height' and 'bottom' are not 'auto' and if the values are overconstrained, then ignore 'bottom' and solve for 'bottom'." />
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style type="text/css"><![CDATA[
div#containing-block
{
background: red url("support/bg-red-2col-3row-320x320.png");
color: transparent;
direction: ltr;
font: 80px/1 Ahem;
height: 320px;
position: relative;
width: 320px;
writing-mode: vertical-lr;
}
div#containing-block > span
{
background-color: red;
bottom: 2em;
color: green;
height: 1em;
margin-bottom: 0em;
margin-top: 0em;
position: absolute;
top: 2em;
}
/*
"
Layout calculation rules (such as those in CSS2.1, Section 10.3) that apply to the horizontal dimension in horizontal writing modes instead apply to the vertical dimension in vertical writing modes.
"
7.1 Principles of Layout in Vertical Writing Modes
http://www.w3.org/TR/css-writing-modes-3/#vertical-layout
So here, *-top and *-bottom properties are input into the §10.3.7 algorithms where *-top properties refer to *-left properties in the layout rules and where *-bottom properties refer to *-right properties in the layout rules.
"
If the values are over-constrained, ignore the value for 'left' (in case the 'direction' property of the containing block is 'rtl') or 'right' (in case 'direction' is 'ltr') and solve for that value.
"
'top' + 'margin-top' + 'border-top-width' + 'padding-top' + 'height' + 'padding-bottom' + 'border-bottom-width' + 'margin-bottom' + 'bottom' = height of containing block
So:
160px : top
+
0px : margin-top
+
0px : border-top-width
+
0px : padding-top
+
80px : height
+
0px : padding-bottom
+
0px : border-bottom-width
+
0px : margin-bottom
+
160px : bottom
=====================
320px : height of containing block
gives us:
160px : top
+
0px : margin-top
+
0px : border-top-width
+
0px : padding-top
+
80px : height
+
0px : padding-bottom
+
0px : border-bottom-width
+
0px : margin-bottom
+
(solve) : bottom
=====================
320px : height of containing block
And so computed bottom value must be 80px .
*/
]]></style>
</head>
<body>
<p><img src="support/pass-cdts-abs-pos-non-replaced.png" width="246" height="36" alt="Image download support must be enabled" /></p>
<div id="containing-block">1 2 34<span>X</span></div>
</body>
</html>