block-replaced-width-001

Block replaced elements and 'auto' specified for 'margin-left', 'margin-right' and intrinsic width

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Assertion
Computed value of 'auto' for 'margin-left' or margin-right' on block replaced elements becomes a used value of '0'. The intrinsic width is also used if 'height' and 'width' are 'auto'.

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: Block replaced elements and 'auto' specified for 'margin-left', 'margin-right' and intrinsic width</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#block-replaced-width">
 7         <meta name="flags" content="ahem image">
 8         <meta name="assert" content="Computed value of 'auto' for 'margin-left' or margin-right' on block replaced elements becomes a used value of '0'. The intrinsic width is also used if 'height' and 'width' are 'auto'.">
 9         <style type="text/css">
10             #div1
11             {
12                 border: solid black;
13                 height: 2in;
14                 width: 2in;
15             }
16             img
17             {
18                 display: block;
19                 margin-left: auto;
20                 margin-right: auto;
21             }
22             div div
23             {
24                 color: orange;
25                 font: 15px/1em Ahem;
26                 text-align: center;
27             }
28         </style>
29     </head>
30     <body>
31         <p>Test passes if the blue and orange boxes below are the same width, and they are horizontally centered inside the black box.</p>
32         <div id="div1">
33             <img alt="blue 15x15" src="support/blue15x15.png">
34             <div>X</div>
35         </div>
36     </body>
37 </html>