abs-pos-non-replaced-vrl-092.xht (3951B)
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 2 3 <html xmlns="http://www.w3.org/1999/xhtml"> 4 5 <head> 6 7 <title>CSS Writing Modes Test: absolutely positioned non-replaced element - 'direction: rtl' and 'top', 'height' and 'bottom' are not 'auto' (overconstrained)</title> 8 9 <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> 10 <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" /> 11 <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" /> 12 <link rel="match" href="abs-pos-non-replaced-vrl-004-ref.xht" /> 13 14 <meta name="flags" content="ahem image" /> 15 <meta name="assert" content="When 'direction' is 'rtl' and 'top', 'height' and 'bottom' are not 'auto' and if the values are overconstrained, then ignore 'top' and solve for 'top'." /> 16 17 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> 18 <style type="text/css"><![CDATA[ 19 div#containing-block 20 { 21 background: red url("support/bg-red-3col-2row-320x320.png"); 22 color: transparent; 23 direction: rtl; 24 font: 80px/1 Ahem; 25 height: 320px; 26 position: relative; 27 width: 320px; 28 writing-mode: vertical-rl; 29 } 30 31 div#containing-block > span 32 { 33 background-color: red; 34 bottom: 2em; 35 color: green; 36 height: 1em; 37 margin-bottom: 0em; 38 margin-top: 0em; 39 position: absolute; 40 top: 2em; 41 } 42 43 /* 44 " 45 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. 46 " 47 7.1 Principles of Layout in Vertical Writing Modes 48 http://www.w3.org/TR/css-writing-modes-3/#vertical-layout 49 50 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. 51 52 " 53 If none of the three is 'auto': If both 'margin-left' and 'margin-right' are 'auto', solve the equation under the extra constraint that the two margins get equal values, unless this would make them negative, in which case when direction of the containing block is 'ltr' ('rtl'), set 'margin-left' ('margin-right') to zero and solve for 'margin-right' ('margin-left'). If one of 'margin-left' or 'margin-right' is 'auto', solve the equation for that value. 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. 54 " 55 56 'top' + 'margin-top' + 'border-top-width' + 'padding-top' + 'height' + 'padding-bottom' + 'border-bottom-width' + 'margin-bottom' + 'bottom' = height of containing block 57 58 So: 59 60 160px : top 61 + 62 0px : margin-top 63 + 64 0px : border-top-width 65 + 66 0px : padding-top 67 + 68 80px : height 69 + 70 0px : padding-bottom 71 + 72 0px : border-bottom-width 73 + 74 0px : margin-bottom 75 + 76 160px : bottom 77 ===================== 78 320px : height of containing block 79 80 gives us: 81 82 (solve) : top 83 + 84 0px : margin-top 85 + 86 0px : border-top-width 87 + 88 0px : padding-top 89 + 90 80px : height 91 + 92 0px : padding-bottom 93 + 94 0px : border-bottom-width 95 + 96 0px : margin-bottom 97 + 98 160px : bottom 99 ===================== 100 320px : height of containing block 101 102 And so computed top value must be 80px . 103 */ 104 105 ]]></style> 106 107 </head> 108 109 <body> 110 111 <p><img src="support/pass-cdts-abs-pos-non-replaced.png" width="246" height="36" alt="Image download support must be enabled" /></p> 112 113 <div id="containing-block">1 2 34<span>X</span></div> 114 115 </body> 116 </html>