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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/CSS2/visuren/top-114.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: position relative - top offset percentage and inherit</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
<link rel="help" title="9.3.2 Box offsets: 'top', 'right', 'bottom', 'left'" href="http://www.w3.org/TR/CSS21/visuren.html#position-props" />
<link rel="help" title="6.2.1 The 'inherit' value" href="http://www.w3.org/TR/CSS21/cascade.html#value-def-inherit" />
<link rel="match" href="top-114-ref.xht" />
<meta content="'top: inherit' makes the top property take the same computed value as the top property for the element's parent; in the case of a percentage value, the computed value is the specified percentage value. 'top: [percentage]' refers to height of containing block." name="assert" />
<style type="text/css"><![CDATA[
div {position: relative;}
div#grand-parent-rel-pos
{
height: 400px;
width: 600px;
}
div#red-rel-pos-overlapped
{
background-color: red;
color: white;
height: 100px;
left: 300px;
top: 50px;
width: 100px;
}
div#parent-rel-pos
{
height: 0px;
left: 50%; /* 50% x 600px == 300px */
/* 'left: [percentage]' refers to width of containing block. */
top: -12.5%; /* -12.5% x 400px == -50px */
/* 'top: [percentage]' refers to height of containing block. */
width: 100px;
}
div#green-child-rel-pos-inherit-overlapping
{
background-color: green;
height: 100px;
left: 0px;
top: inherit;
/*
=====================================
top: inherit should resolve as top: -12.5% because
"the property takes the same computed value as the
property for the element's parent"
CSS 2.1, section 6.2.1 The 'inherit' value
and
"Computed value: (...) if specified as a percentage, [then]
the specified [percentage] value"
So, the top offset of #green-child-rel-pos-inherit-overlapping
should be -12.5%, which is -12.5% of the height of its containing
block (#parent-rel-pos) which is 0px.
=====================================
*/
width: 100px;
}
]]></style>
</head>
<body>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="grand-parent-rel-pos">
<div id="red-rel-pos-overlapped">test FAILED</div>
<div id="parent-rel-pos">
<div id="green-child-rel-pos-inherit-overlapping"></div>
</div>
</div>
</body>
</html>