test_bug2022026.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test for changing styles in selectstart event listener</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>

<pre id="test">

<script class="testbody">

SimpleTest.waitForExplicitFinish();

SpecialPowers.pushPrefEnv({"set": [

  ["general.smoothScroll", false],

  ["accessibility.browsewithcaret", true]

]}, runTest);

function getSelectionController() {

  return SpecialPowers.wrap(window)

    .docShell

    .QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor)

    .getInterface(SpecialPowers.Ci.nsISelectionDisplay)

    .QueryInterface(SpecialPowers.Ci.nsISelectionController);

function runTest() {

  let scroller = document.createElement("div");

  scroller.style.cssText = "overflow:auto; height:200px; width:300px";

  for (let i = 0; i < 100; i++) {

    let p = document.createElement("p");

    p.textContent = "Line " + i;

    scroller.appendChild(p);

  document.body.insertBefore(scroller, document.getElementById("test"));

  scroller.offsetHeight;

  getSelection().collapse(scroller.firstChild.firstChild, 0);

  let selectstartFired = false;

  document.addEventListener("selectstart", function() {

    selectstartFired = true;

    scroller.style.display = "none";

    document.body.offsetHeight;

  }, {once: true});

  scroller.focus();

  focus();

  const selectionController = getSelectionController();

  try {

    selectionController.pageMove(true, true);

  } catch (err) {

    // Ignore exception which is caused by hiding the scroller.

  SimpleTest.executeSoon(function() {

    ok(selectstartFired, "selectstart event fired during Shift+PageDown");

    SimpleTest.finish();

});

</script>

</pre>

</body>

</html>