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 margins with an element 'height' of 'auto' and 'min-height' of zero</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="An element's margins are adjoining and can collapse if the 'min-height' is zero, if it has no top or bottom borders and no top or bottom padding, if it has a 'height' of zero or 'auto', if it has no line boxes and if all of its in-flow children's margins are adjoining.">
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 #div3
21 {
22 background: red;
23 height: auto;
24 min-height: 0;
25 }
26 #div2, #div5
27 {
28 background: green;
29 height: 1em;
30 }
31 #div3, #div4
32 {
33 margin-bottom: 2em;
34 margin-top: 2em;
35 }
36 </style>
37 </head>
38 <body>
39 <p>Test passes if there is no red visible on the page.</p>
40 <div id="div1">
41 <div id="div2"></div>
42 <div id="div3">
43 <div id="div4"></div>
44 </div>
45 <div id="div5"></div>
46 </div>
47 </body>
48 </html>