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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Backgrounds Test: box-shadow and empty box (edge)</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#the-box-shadow">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta content="This test checks that an empty box can have a box shadow." name="assert">
<!--
<shadow> = inset? && <length>{2,4} && <color>?
A comma-separated pair of numbers in curly braces {A,B}
indicates that the preceding type, word, or group occurs
at least A and at most B times.
A question mark (?) indicates that the preceding type,
word, or group is optional (occurs zero or one times).
The components of each <shadow> are interpreted as follows:
1st <length>
Specifies the horizontal offset
of the shadow. A positive value draws a shadow that is offset to the right of the box, a negative length to the left.
2nd <length>
Specifies the vertical offset
of the shadow. A positive value offsets the shadow down, a negative one up.
4th <length>
Specifies the spread distance. Positive values cause the shadow to expand in all directions by the specified radius. Negative values cause the shadow to contract.
-->
<style>
div#green-overlapping-test
{
background-color: red;
height: 0px;
width: 0px;
box-shadow: green 50px 50px 0px 50px;
}
div#red-overlapped-reference
{
background-color: red;
height: 100px;
position: relative;
width: 100px;
z-index: -1;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.
<div id="green-overlapping-test"></div>
<div id="red-overlapped-reference"></div>
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