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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=842853
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 842853</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <script type="application/javascript">
+
+ /** Test for Bug 842853 **/
+
+SimpleTest.waitForExplicitFinish();
+
+async function runTest() {
+ var win = e.contentWindow;
+ if (win.location.hash != '') {
+ // Allow a half pixel difference because the scroll position is aligned with
+ // screen pixels instead of CSS pixels (bug 1774315).
+ isfuzzy(win.scrollY, 500, 0.5);
+ SimpleTest.finish();
+ return;
+ }
+ win.location.hash='#anchor'
+ win.scrollTo(0,500);
+ win.location.reload()
+}
+
+
+ </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=842853">Mozilla Bug 842853</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+<script>
+
+var e = document.createElement('iframe');
+var url = 'file_bug842853-frame.html';
+e.setAttribute('src',url);
+e.setAttribute('onload','runTest()');
+document.body.appendChild(e);
+
+</script>
+</body>
+</html>