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test_scroll_event_ordering.html 
<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=785588
-->
<head>
  <title>Test for Bug 785588 --- ordering of scroll-related events</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.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=785588">Mozilla Bug 785588</a>
<div id="content">
  <div id="d" style="border:2px solid black; width:100px; height:100px; overflow:auto">
    <div id="inner" style="height:200px;">Hello</div>
  </div>
</div>
<pre id="test">
<script>
SimpleTest.waitForExplicitFinish();

var smoothScrollPref = "general.smoothScroll";
SpecialPowers.setBoolPref(smoothScrollPref, false);

var d = document.getElementById("d");
d.scrollTop = 0;
var inner = document.getElementById("inner");

var state = "initial";

function onFrame() {
  is(state, "initial", "Must be in initial state");
  ok(d.scrollTop > 0, "Must have scrolled by some amount (got " + d.scrollTop + ")");
  state = "didOnFrame";
}

function onScroll() {
  is(state, "didOnFrame", "Must have got requestAnimationFrame callback already");
  ok(d.scrollTop > 0, "Must have scrolled by some amount (got " + d.scrollTop + ")");
  SpecialPowers.clearUserPref(smoothScrollPref);
  SimpleTest.finish();
}

function doTest() {
  window.getSelection().collapse(inner.firstChild, 0);
  window.mozRequestAnimationFrame(onFrame);
  d.onscroll = onScroll;
  sendKey("DOWN");
}

SimpleTest.waitForFocus(doTest);
</script>
</pre>
</body>
</html>
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