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 with 'margin-left' and 'margin-right' set to 'auto'</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-width">
7 <meta name="flags" content="ahem">
8 <meta name="assert" content="When 'left', 'width' and 'right' are not 'auto', set 'margin-left' and 'margin-right' to equal values.">
9 <style type="text/css">
10 #containingblock
11 {
12 border: solid black;
13 height: 2in;
14 position: relative;
15 width: 4in;
16 }
17 div div
18 {
19 /* left + margin-left + border-left-width + padding-left + width + padding-right + border-right-width + margin-right + right = width of containing block */
20 /* 1in + solve + 0 + 0 + 1in + 0 + 0 + solve + -2in = 4in */
21 background: red;
22 color: blue;
23 font: 1in/1em Ahem;
24 left: 1in;
25 margin-left: auto; /* value is solved to 2in */
26 margin-right: auto; /* value is solved to 2in */
27 position: absolute;
28 right: -2in;
29 width: 1in;
30 }
31 </style>
32 </head>
33 <body>
34 <p>Test passes if the blue square in in the upper-right corner of the black rectangle and there is no red visible on the page.</p>
35 <div id="containingblock">
36 <div>X</div>
37 </div>
38 </body>
39 </html>