1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
2 <html>
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="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height">
7 <meta name="flags" content="">
8 <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.">
9 <style type="text/css">
10 #div1
11 {
12 border: solid black;
13 height: 3in;
14 position: relative;
15 width: 3in;
16 }
17 div div
18 {
19 background: blue;
20 bottom: 0.5in;
21 height: 1in;
22 margin-bottom: auto;
23 margin-top: auto;
24 position: absolute;
25 top: 0.5in;
26 width: 100%;
27 }
28 </style>
29 </head>
30 <body>
31 <p>Test passes if the blue box is vertically centered in the black box.</p>
32 <div id="div1">
33 <div></div>
34 </div>
35 </body>
36 </html>