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Test Info:

<!DOCTYPE HTML>
<html>
<!--
-->
<head>
<title>Test for Bug 505515</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<style type="text/css">
#display { color: black; background: white; }
#display span { position: relative; display: inline-block; }
#display:first-line { color: blue; }
</style>
</head>
<body onload="run()">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=505515">Mozilla Bug 505515</a>
<p id="display" style="width: 30em">This <span id="sp">is</span> some text in which the first line is in a different color.</p>
<pre id="test">
<script type="application/javascript">
SimpleTest.waitForExplicitFinish();
/** Test for Bug 505515 **/
function run() {
var p = document.getElementById("display");
var span = document.getElementById("sp");
isnot(span.offsetWidth, 0,
"span should have width (and we flushed layout)");
is(getComputedStyle(p, "").color, "rgb(0, 0, 0)",
"p should be black too");
let spanStyle = getComputedStyle(span, "");
let width = spanStyle.width;
isnot(width.indexOf("px"), -1,
"should be able to get the used value")
is(width, spanStyle.width,
"shouldn't lose track of the frame");
is(spanStyle.color, "rgb(0, 0, 0)",
"span should be black");
SimpleTest.finish();
}
</script>
</pre>
</body>
</html>