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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test bug 784410</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script src="/tests/SimpleTest/EventUtils.js"></script>
+ <script src="/tests/SimpleTest/paint_listener.js"></script>
+ <script src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="outer" style="overflow:auto; height:200px; border:2px dotted black; transform: translateY(1px)" onscroll="doneScroll()">
+ <div id="d" style="overflow:auto; height:102px;" onscroll="doneScroll()">
+ <div id="inner" style="height:100.1px; border:1px solid black; background:yellow;">Hello</div>
+ </div>
+ <div style="height:500px;"></div>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+var sel = window.getSelection();
+var outer = document.getElementById("outer");
+var d = document.getElementById("d");
+var inner = document.getElementById("inner");
+var smoothScrollPref = "general.smoothScroll";
+
+function innerScrollOffset() {
+ return inner.getBoundingClientRect().top - d.getBoundingClientRect().top;
+}
+var innerStartScrollOffset = innerScrollOffset();
+
+var step = 0;
+var wheelAndPaintDone = false;
+async function doneScroll() {
+ ++step;
+ switch (step) {
+ case 1:
+ is(innerScrollOffset(), innerStartScrollOffset, "Inner element should not have scrolled down");
+ ok(outer.scrollTop > 0, "Outer element should have scrolled down");
+
+ outer.scrollTop = 0;
+ break;
+ case 2:
+ // wait until APZ is ready to handle the wheel event, then send it
+ await promiseApzFlushedRepaints();
+ // Wait for paints to flush, so APZ is notified of the new scroll offset.
+ sendWheelAndPaint(inner, 4, 4,
+ { deltaMode: WheelEvent.DOM_DELTA_LINE, deltaY: 1 },
+ function() {
+ wheelAndPaintDone = true;
+ doneTest();
+ });
+ break;
+ case 3:
+ is(innerScrollOffset(), innerStartScrollOffset, "Inner element should not have scrolled down");
+ ok(outer.scrollTop > 0, "Outer element should have scrolled down");
+
+ doneTest();
+ break;
+ }
+}
+
+function doneTest() {
+ // wait until wheelAndPaintDone has invoked its callback before we end the
+ // test, otherwise we might get calls to advanceTimeAndRefresh after we
+ // restore normal refresh, and that will screw up the next test.
+ if (wheelAndPaintDone && step == 3) {
+ SpecialPowers.DOMWindowUtils.restoreNormalRefresh();
+ SimpleTest.finish();
+ }
+}
+
+function test() {
+ sel.collapse(inner.firstChild, 2);
+ synthesizeKey("KEY_PageDown");
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+ SpecialPowers.pushPrefEnv({"set":[[smoothScrollPref, false],
+ ["test.events.async.enabled", true]]}, test);
+});
+</script>
+</pre>
+</body>
+</html>