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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 Test: Absolutely positioned, non-replaced elements, 'height' based on 'top' and 'bottom' positions</title>
+ <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
+ <link rel="reviewer" title="GĂ©rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-08-31 -->
+ <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height" />
+ <link rel="match" href="absolute-non-replaced-height-003-ref.xht" />
+
+ <meta name="assert" content="The 'auto' values on 'margin-top', 'margin-bottom' are set to '0' and the 'height' is the remaining space between the 'top' and 'bottom' positions, when 'height' is 'auto' and 'top' and 'bottom' are both not 'auto'." />
+ <style type="text/css">
+ #div1
+ {
+ border: solid black;
+ height: 3in;
+ position: relative;
+ width: 3in;
+ }
+ div div
+ {
+ background: blue;
+ bottom: 1in;
+ height: auto;
+ margin-bottom: auto;
+ margin-top: auto;
+ position: absolute;
+ top: 1in;
+ width: 100%;
+ }
+
+ /*
+
+ 1in : top
+ +
+ auto (to solve): margin-top
+ +
+ 0 : border-top-width
+ +
+ 0 : padding-top
+ +
+ auto (to solve) : height
+ +
+ 0 : padding-bottom
+ +
+ 0 : border-bottom-width
+ +
+ auto (to solve): margin-bottom
+ +
+ 1in : bottom
+ =============
+ 3in : height of containing block
+
+
+ "
+ 'height' is 'auto', 'top' and 'bottom' are not 'auto',
+ then 'auto' values for 'margin-top' and 'margin-bottom' are set to 0
+ and solve for 'height'
+ "
+
+ so this brings:
+
+ 1in : top
+ +
+ 0 (set): margin-top
+ +
+ 0 : border-top-width
+ +
+ 0 : padding-top
+ +
+ auto (to solve) : height
+ +
+ 0 : padding-bottom
+ +
+ 0 : border-bottom-width
+ +
+ 0 (set): margin-bottom
+ +
+ 1in : bottom
+ =============
+ 3in : height of containing block
+
+ So, height must use 1in in order to balance the equation
+
+ */
+ </style>
+ </head>
+ <body>
+ <p>Test passes if a blue rectangle is <strong>vertically centered</strong> in an hollow black square.</p>
+ <div id="div1">
+ <div></div>
+ </div>
+ </body>
+</html>