docshell/test/test_bug662170.html

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=662170
-->
<head>
  <title>Test for Bug 662170</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="/tests/SimpleTest/WindowSnapshot.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=662170">Mozilla Bug 662170</a>

<script type="application/javascript;version=1.7">

/** Test for Bug 662170 **/
SimpleTest.waitForExplicitFinish();

function childLoad() {
  // Spin the event loop so we leave the onload handler.
  SimpleTest.executeSoon(childLoad2);
}

function childLoad2() {
  let cw = $('iframe').contentWindow;

  // When we initially load the page, we should be at the top.
  is(cw.pageYOffset, 0, 'Initial Y offset should be 0.');
  
  // Scroll the iframe to the bottom.
  cw.scrollTo(0, 300);

  // Did we actually scroll somewhere?
  isnot(cw.pageYOffset, 0, 'Y offset should be non-zero after scrolling.');

  // Now load file_bug662170.html#, which should take us to the top of the
  // page.
  cw.location = cw.location + '#';

  is(cw.pageYOffset, 0, 'Correct Y offset after loading #.');
  SimpleTest.finish();
}

</script>

<!-- When the iframe loads, it calls childLoad(). -->
<iframe height='100px' id='iframe' src='file_bug662170.html'></iframe>

</body>
</html>