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diff --git a/layout/base/tests/chrome/dialog_with_positioning_window.xhtml b/layout/base/tests/chrome/dialog_with_positioning_window.xhtml
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+++ b/layout/base/tests/chrome/dialog_with_positioning_window.xhtml
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+<?xml version="1.0" encoding="UTF-8" ?>
+<?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+ onload="setTimeout(runTest, 0)">
+ <vbox>
+ <label value="powered by example.com" style="padding: 16px;"/>
+ </vbox>
+ <hbox id="t" style="display: block; position: fixed; right: 16px; bottom: 16px;">
+ <button label="OK"/>
+ </hbox>
+<script><![CDATA[
+var SimpleTest = window.arguments[0].SimpleTest;
+var SpecialPowers = window.arguments[0].SpecialPowers;
+var is = window.arguments[0].is;
+var ok = window.arguments[0].ok;
+
+// We run this off a setTimeout from onload, because the XUL window
+// only does its intrinsic-height layout after the load event has
+// finished
+function runTest() {
+ var t = document.getElementById("t");
+ var tBottom = t.getBoundingClientRect().bottom;
+ is(tBottom, document.documentElement.getBoundingClientRect().bottom - 16,
+ "check fixed-pos element t bottom positioned correctly");
+ ok(tBottom < 200, "fixed-pos element t bottom must be sane, less than 200 (got " + tBottom + ")");
+ window.close();
+ SimpleTest.finish();
+}
+]]></script>
+</window>