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Test Info:

<!DOCTYPE HTML>
<html>
<!--
-->
<head>
<meta charset="utf-8">
<title>Test for Bug 800983</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<style>
#display::before { content: "Visible"; display: block }
#display {
display: inline;
margin-top: 0;
background: yellow;
color: blue;
}
</style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=800983">Mozilla Bug 800983</a>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
<script type="application/javascript">
/** Test for Bug 800983 **/
var cs = getComputedStyle($("display"));
var cs_pseudo = getComputedStyle($("display"), "::before")
var cs_default = getDefaultComputedStyle($("display"));
var cs_default_pseudo = getDefaultComputedStyle($("display"), "::before");
// Sanity checks for normal computed style
is(cs.display, "inline", "We have inline display");
is(cs.marginTop, "0px", "We have 0 margin");
is(cs.backgroundColor, "rgb(255, 255, 0)", "We have yellow background");
is(cs.color, "rgb(0, 0, 255)", "We have blue text");
is(cs_pseudo.content, '"Visible"', "We have some content");
is(cs_pseudo.display, "block", "Our ::before is block");
// And now our actual tests
is(cs_default.display, "block", "We have block display by default");
is(cs_default.marginTop, "16px", "We have 16px margin by default");
is(cs_default.backgroundColor, "rgba(0, 0, 0, 0)",
"We have transparent background by default");
is(cs_default.color, "rgb(0, 0, 0)", "We have black text by default");
is(cs_default_pseudo.content, "none", "We have no content by default");
is(cs_default_pseudo.display, "inline", "Our ::before is inline by default");
</script>
</pre>
</body>
</html>