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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/CSS2/margin-padding-clear/margin-em-inherit-001.xht - WPT Dashboard Interop Dashboard
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<head>
<title>CSS Test: inherit applied on margin set with em</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
<link rel="help" title="4.3.2 Length" href="http://www.w3.org/TR/CSS21/syndata.html#length-units" />
<link rel="help" title="6.2.1 The 'inherit' value" href="http://www.w3.org/TR/CSS21/cascade.html#value-def-inherit" />
<link rel="help" title="8.3 Margin properties" href="http://www.w3.org/TR/CSS21/box.html#margin-properties" />
<link rel="match" href="margin-em-inherit-001-ref.xht" />
<meta content="The 'em' unit is equal to the computed value of the 'font-size' property of the element on which it is used. When inherit keyword is used, the property takes the same computed value - a length value in this testcase - as the property for the element's parent." name="assert" />
<meta content="image" name="flags" />
<style type="text/css"><![CDATA[
body {margin: 8px;}
p
{
font: 1em/1.25 serif;
margin: 1em 0em;
}
div#grand-parent {width: 600px;}
div#parent
{
background-color: green;
border: white solid 6px;
/*
Such border prevents margin collapsing between
#parent's vertical margins and #child's vertical margins
*/
font-size: 28px;
margin: 2em 3em 1em 4em; /* 56px 84px 28px 112px */
}
div#child
{
font-size: 40px;
margin: inherit;
/*
What is inherited is a computed length value: so
it is 56px 84px 28px 112px and not 80px 120px 40px 160px
*/
}
div#abs-pos-overlapping-green
{
left: 238px;
position: absolute;
top: 174px;
}
/*
8px (body's margin-left)
+ 112px (#parent's margin-left)
+ 6px (#parent's border-left)
+ 112px (#child's margin-left)
==================
238px
*/
/*
16px (max(8px, 16px): body's margin-top collapses with p's margin-top)
+ 20px (first line)
+ 20px (second line)
+ 56px (max(16px, 56px): p's margin-bottom collapses with #parent's margin-top)
+ 6px (#parent's border-top)
+ 56px (#child's margin-top)
==================
174px
*/
]]></style>
</head>
<body>
<p>Test passes if there is a filled green<br />
rectangle and if there is no red.</p>
<div id="grand-parent">
<div id="parent">
<div id="child"><img src="support/100x100-red.png" alt="Image download support must be enabled" /></div>
</div>
</div>
<div id="abs-pos-overlapping-green"><img src="support/swatch-green.png" width="100" height="100" alt="Image download support must be enabled" /></div>
</body>
</html>