test_scroll_event_ordering.html

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<!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 src="/tests/SimpleTest/SimpleTest.js"></script>

  <script 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";

var d = document.getElementById("d");

d.scrollTop = 0;

var inner = document.getElementById("inner");

var state = "initial";

function onFrame() {

  is(state, "didOnScroll", "Must have got scroll event already");

  state = "didOnFrame";

  SimpleTest.finish();

function onScroll() {

  is(state, "initial", "Must be in initial state");

  ok(d.scrollTop > 0, "Must have scrolled by some amount (got " + d.scrollTop + ")");

  state = "didOnScroll";

function doTest() {

  window.getSelection().collapse(inner.firstChild, 0);

  window.requestAnimationFrame(onFrame);

  d.onscroll = onScroll;

  d.scroll(0, 100);

function prepareTest() {

  // Start the test after we've gotten at least one rAF callback, to make sure

  // that rAF is no longer throttled. (See bug 1145439.)

  window.requestAnimationFrame(function() {

    SpecialPowers.pushPrefEnv({"set":[[smoothScrollPref, false]]}, doTest);

});

SimpleTest.waitForFocus(prepareTest);

</script>

</pre>

</body>

</html>