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diff --git a/layout/style/test/test_computed_style_no_pseudo.html b/layout/style/test/test_computed_style_no_pseudo.html
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index 0000000000..efb0dda7b4
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+++ b/layout/style/test/test_computed_style_no_pseudo.html
@@ -0,0 +1,53 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=505515
+-->
+<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>