<!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 'height' and 'bottom' are 'auto' and 'top' is 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-vlr-013-ref.xht" /> <meta name="flags" content="ahem image" /> <meta name="assert" content="When 'direction' is 'ltr' and 'height' and 'bottom' are 'auto' and 'top' is not 'auto', then the height is based on the content and then solve for 'bottom'." /> <link type="text/css" rel="stylesheet" href="support/ahem.css" /> <style type="text/css"><![CDATA[ html { -ah-writing-mode: vertical-lr; -webkit-writing-mode: vertical-lr; writing-mode: tb-lr; /* IE11 */ writing-mode: vertical-lr; } div#containing-block { background: red url("support/bg-red-2col-2row-320x320.png"); color: transparent; direction: ltr; font: 80px/1 Ahem; height: 320px; position: relative; width: 320px; } div#containing-block > span { background-color: red; bottom: auto; color: green; height: auto; position: absolute; top: 1em; } /* " 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. " 3. 'width' and 'right' are 'auto' and 'left' is not 'auto', then the width is shrink-to-fit . Then solve for 'right' " 'top' + 'margin-top' + 'border-top-width' + 'padding-top' + 'height' + 'padding-bottom' + 'border-bottom-width' + 'margin-bottom' + 'bottom' = height of containing block So: 80px : top + 0px : margin-top + 0px : border-top-width + 0px : padding-top + (based on the content) : height: auto + 0px : padding-bottom + 0px : border-bottom-width + 0px : margin-bottom + (solve) : bottom: auto ===================== 320px : height of containing block gives us: 80px : top + 0px : margin-top + 0px : border-top-width + 0px : padding-top + 80px : (based on the content) : height: auto + 0px : padding-bottom + 0px : border-bottom-width + 0px : margin-bottom + (solve) : bottom: auto ===================== 320px : height of containing block And so computed bottom 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>