test_bug784410.html

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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>