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>