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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, 'margin-bottom' set to 'auto'</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="When 'top', 'bottom' and 'height' are all are not 'auto', 'margin-top' is not 'auto' and 'margin-bottom' is 'auto'. Then 'margin-bottom' becomes the remainder of the height of the containing box." />
+ <style type="text/css">
+ #div1
+ {
+ border: solid black;
+ height: 3in;
+ position: relative;
+ width: 3in;
+ }
+ div div
+ {
+ background: blue;
+ bottom: 0.5in;
+ height: 1in;
+ margin-bottom: auto;
+ margin-top: 0.5in;
+ position: absolute;
+ top: 0.5in;
+ width: 100%;
+ }
+
+ /*
+
+ 0.5in : top
+ +
+ 0.5in : margin-top
+ +
+ 0 : border-top-width
+ +
+ 0 : padding-top
+ +
+ 1in: height
+ +
+ 0 : padding-bottom
+ +
+ 0 : border-bottom-width
+ +
+ auto (solve) : margin-bottom
+ +
+ 0.5in : bottom
+ =============
+ 3.0in : height of containing block
+
+ So, margin-bottom must use 0.5in so that the equation gets balanced.
+
+ */
+
+
+ </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>