tor-browser

The Tor Browser
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absolute-non-replaced-height-003.xht (2265B)

      1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
      2 <html xmlns="http://www.w3.org/1999/xhtml">
      3     <head>
      4         <title>CSS Test: Absolutely positioned, non-replaced elements, vertical centering</title>
      5         <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
      6         <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-08-31 -->
      7         <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height" />
      8 		<link rel="match" href="absolute-non-replaced-height-003-ref.xht" />
      9 
     10         <meta name="assert" content="An absolutely positioned non-replaced element's padding box (which is the area painted by background-color of the element) will be vertically centered within its containing block only if both 'margin-top' and 'margin-bottom' have equal values and if 'top' and 'bottom' have equal values. An absolutely positioned non-replaced element's margin box will be vertically centered within its containing block only if 'top' and 'bottom' have equal values." />
     11         <style type="text/css">
     12             #div1
     13             {
     14                 border: solid black;
     15                 height: 3in;
     16                 position: relative;
     17                 width: 3in;
     18             }
     19             div div
     20             {
     21                 background: blue;
     22                 bottom: 0.5in;
     23                 height: 1in;
     24                 margin-bottom: auto;
     25                 margin-top: auto;
     26                 position: absolute;
     27                 top: 0.5in;
     28                 width: 100%;
     29             }
     30 
     31 		/*
     32 
     33 		0.5in : top
     34 	+
     35 		auto (solve): margin-top
     36 	+
     37 		0 : border-top-width
     38 	+
     39 		0 : padding-top
     40 	+
     41 		1in : height
     42 	+
     43 		0 : padding-bottom
     44 	+
     45 		0 : border-bottom-width
     46 	+
     47 		auto (solve) : margin-bottom
     48 	+
     49 		0.5in : bottom
     50 	=============
     51 		3.0in : height of containing block
     52 
     53 	So, margin-bottom and margin-top must use 0.5in so that the equation gets balanced.
     54 
     55 		*/
     56 
     57 
     58         </style>
     59     </head>
     60     <body>
     61         <p>Test passes if a blue rectangle is <strong>vertically centered</strong> in an hollow black square.</p>
     62         <div id="div1">
     63             <div></div>
     64         </div>
     65     </body>
     66 </html>