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 - in-flow block-level margin adjoining child's margin</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 an in-flow block-level element (#div3) is adjoining its in-flow block-level child's top margin and the child has no top border, no top padding or no clearance applied to it, then such top margins collapse.">
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 }
29 #div3, #div4
30 {
31 margin-top: 2em;
32 }
33 </style>
34 </head>
35 <body>
36 <p>Test passes if there is no red visible on the page.</p>
37 <div id="div1">
38 <div id="div2"></div>
39 <div id="div3">
40 <div id="div4"></div>
41 </div>
42 </div>
43 </body>
44 </html>