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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: Vertical centering with negative and positive top positioning</title>
+ <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
+ <link rel="help" href="http://www.w3.org/TR/CSS21/visuren.html#positioning-scheme" />
+ <link rel="match" href="position-relative-nested-001-ref.xht" />
+
+ <meta name="assert" content="Equal 50% positive and negative positioning can vertically center objects." />
+ <style type="text/css">
+ #outer
+ {
+ background: green repeat-x center url('support/red_box.png');
+ /* red_box.png is a 100px by 100px red square */
+ height: 300px;
+ width: 200px;
+ }
+ #inner
+ {
+ background-color: red;
+ height: 100px;
+ position: relative;
+ top: 50%
+ }
+ #inner-most
+ {
+ background-color: green;
+ height: 150px;
+ /* 150px == top-half of red_box.png's height + #inner's height */
+ position: relative;
+ top: -50%;
+ /* 50% is 50% of the height of #inner-most's containing block
+ which is #inner */
+ /* to move the top of the #inner-most box from pixel 150
+ on the y-axis of #outer to pixel 100 on the y-axis of #outer */
+ }
+ </style>
+ </head>
+ <body>
+ <p>Test passes if there is <strong>no red</strong>.</p>
+ <div id="outer">
+ <div id="inner">
+ <div id="inner-most"></div>
+ </div>
+ </div>
+ </body>
+</html>