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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' is 'auto' and 'height' and 'bottom' are not 'auto'</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="s71-abs-pos-non-replaced-vrl-002-ref.xht" />
+
+  <meta name="flags" content="ahem image" />
+  <meta name="assert" content="When 'direction' is 'ltr' and 'top' is 'auto' and 'height' and 'bottom' are not 'auto', then solve for 'top'." />
+
+  <link type="text/css" rel="stylesheet" href="support/ahem.css" />
+
+  <style type="text/css"><![CDATA[
+  div#containing-block
+    {
+      background: red url("support/bg-red-3col-3row-320x320.png");
+      color: transparent;
+      direction: ltr;
+      font: 80px/1 Ahem;
+      height: 320px;
+      position: relative;
+      width: 320px;
+      -ah-writing-mode: vertical-rl;
+      -webkit-writing-mode: vertical-rl;
+      writing-mode: tb-rl; /* IE11 */
+      writing-mode: vertical-rl;
+    }
+
+  div#containing-block > span
+    {
+      background-color: red;
+      bottom: 1em;
+      color: green;
+      height: 1em;
+      position: absolute;
+      top: auto;
+    }
+
+/*
+"
+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.
+
+"
+4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve for 'left'
+"
+
+'top' + 'margin-top' + 'border-top-width' + 'padding-top' + 'height' + 'padding-bottom' + 'border-bottom-width' + 'margin-bottom' + 'bottom' = height of containing block
+
+So:
+
+  (solve) : top: auto
+  +
+      0px : margin-top
+  +
+      0px : border-top-width
+  +
+      0px : padding-top
+  +
+     80px : height
+  +
+      0px : padding-bottom
+  +
+      0px : border-bottom-width
+  +
+      0px : margin-bottom
+  +
+     80px : bottom
+    =====================
+    320px : height of containing block
+
+And so computed top value must be 160px .
+*/
+
+  ]]></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>
+\ No newline at end of file