block-non-replaced-width-007

Box centering with 'margin-left' and 'margin-right' set to auto

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Flags
ahem
Assertion
When 'margin-left' and 'margin-right' are set to auto and the element has a 'width' then the box will be centered.

Source

 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: Box centering 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#blockwidth">
 7         <meta name="flags" content="ahem">
 8         <meta name="assert" content="When 'margin-left' and 'margin-right' are set to auto and the element has a 'width' then the box will be centered.">
 9         <style type="text/css">
10             #div1
11             {
12                 border: solid black;
13                 height: 2in;
14                 width: 2in;
15             }
16             #div2
17             {
18                 background-color: orange;
19                 border-color: orange;
20                 border-style: solid;
21                 border-width: 0 0.25in;
22                 margin: 0 auto;
23                 padding: 0;
24                 height: 1in;
25                 width: 0.5in;
26             }
27             #div3
28             {
29                 color: blue;
30                 font: 1in/1em Ahem;
31                 text-align: center;
32             }
33         </style>
34     </head>
35     <body>
36         <p>Test passes if the blue and orange boxes are the same width and the blue box is directly below the orange box.</p>
37         <div id="div1">
38             <div id="div2"></div>
39             <div id="div3">X</div>
40         </div>
41     </body>
42 </html>