blob: 6e0dbf05c53150942139fff0e4636f1a6c177554 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>CSS Test: Margin collapsing - margins of a 'collapsed through' box without clearance can collapse with parent block's bottom margin</title>
<link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" />
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
<link rel="author" title="Daniel Schattenkirchner" href="mailto:crazy-daniel@gmx.de" />
<link rel="match" href="margin-collapse-clear-017-ref.xht" />
<meta content="An element that does not have clearance applied to it can collapse its top margin with its parent block's bottom margin. Margins of a 'collapsed through' box without clearance applied to it can collapse with its parent block's bottom margin. An element with 'clear' set to a value other than 'none' can create a clearance only if and only when there is an earlier (in the source document) floating box." name="assert" />
<meta content="image" name="flags" />
<style type="text/css"><![CDATA[
body
{
background: white url("support/ruler-v-100px-200px-300px.png") no-repeat;
margin: 34px 8px 8px 55px;
/*
34px : body's top margin collapsing with p's top margin: max(34px, 16px)
+ 20px : p's 1st line box height
+ 20px : p's 2nd line box height
+ 16px : p's bottom margin
+ 10px : height of topmost green bar
======
100px
*/
}
p
{
font-size: 16px;
line-height: 20px;
margin: 1em 8px;
}
div#parent-block {margin-bottom: 100px;}
div.vertical-gap-separator
{
background-color: green;
height: 10px;
}
div#element-without-clearance
{
clear: both;
margin-top: 100px;
}
/*
In this test, div#element-without-clearance
is what the spec refers to as
'collapsed through' box
http://www.w3.org/TR/CSS21/box.html#collapsed-through
*/
]]></style>
</head>
<body>
<p>Test passes if there is a vertical gap<br />
of exactly 100px between 2 green bars.</p>
<div id="parent-block">
<div class="vertical-gap-separator"></div>
<div id="element-without-clearance"></div>
</div>
<div class="vertical-gap-separator"></div>
<!--
div#element-without-clearance's margin-top should collapse
with #parent-block's margin-bottom: max(100px, 100px) = 100px
-->
</body>
</html>
|
