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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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layout/base/tests/test_scroll_event_ordering.html Normal file
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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 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";
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 + ")");
SimpleTest.finish();
}
function doTest() {
window.getSelection().collapse(inner.firstChild, 0);
window.requestAnimationFrame(onFrame);
d.onscroll = onScroll;
sendKey("DOWN");
}
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>