margin-collapse-016

Margin collapsing - top/bottom margins adjoining collapse through

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Flags
ahem, image
Assertion
When top and bottom margins are adjoining margins collapse through that element.

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: Margin collapsing - top/bottom margins adjoining collapse through</title>
 5         <link rel="author" title="Microsoft" href="http://www.microsoft.com/">
 6         <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins">
 7         <meta name="flags" content="ahem image">
 8         <meta name="assert" content="When top and bottom margins are adjoining margins collapse through that element.">
 9         <style type="text/css">
10             div
11             {
12                 font: 20px/1em Ahem;
13                 width: 5em;
14             }
15             #div1
16             {
17                 background: url('support/margin-collapse-2em-space.png');
18                 height: 4em;
19             }
20             #div2, #div4
21             {
22                 background:green;
23                 height: 1em;
24             }
25             #div3
26             {
27                 background: red;
28                 height: 0;
29             }
30             #div2, #div3
31             {
32                 margin-bottom: 2em;
33             }
34             #div3, div4
35             {
36                 margin-top: 2em;
37             }
38         </style>
39     </head>
40     <body>
41         <p>Test passes if there is no red visible on the page.</p>
42         <div id="div1">
43             <div id="div2"></div>
44             <div id="div3"></div>
45             <div id="div4"></div>
46         </div>
47     </body>
48 </html>