test_bug915962.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=915962

-->

<head>

  <title>Test for Bug 915962</title>

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

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

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

  <script type="text/javascript" src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=915962">Mozilla Bug 915962</a>

<p id="display"></p>

<div id="content">

</div>

<pre id="test">

<script type="application/javascript">

/** Test for Bug 915962 **/

var smoothScrollPref = "general.smoothScroll";

SimpleTest.waitForExplicitFinish();

var win = window.open("file_bug915962.html", "_blank",

                      "width=600,height=600,scrollbars=yes");

function waitForScrollEvent(aWindow) {

  return new Promise(resolve => {

    aWindow.addEventListener("scroll", () => { SimpleTest.executeSoon(resolve); }, {once: true, capture: true});

});

function waitAndCheckNoScrollEvent(aWindow) {

  let gotScroll = false;

  function recordScroll() {

    gotScroll = true;

  aWindow.addEventListener("scroll", recordScroll, {capture: true});

  return waitToClearOutAnyPotentialScrolls(aWindow).then(function() {

        aWindow.removeEventListener("scroll", recordScroll, {capture: true});

        is(gotScroll, false, "check that we didn't get a scroll");

});

SimpleTest.waitForFocus(function() {

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

}, win);

async function startTest() {

  // Make sure that pressing Space when a tabindex=-1 element is focused

  // will scroll the page.

  var button = win.document.querySelector("button");

  var sc = win.document.querySelector("div");

  sc.focus();

  await waitToClearOutAnyPotentialScrolls(win);

  is(win.scrollY, 0, "Sanity check");

  let waitForScrolling = waitForScrollEvent(win);

  synthesizeKey(" ", {}, win);

  await waitForScrolling;

  isnot(win.scrollY, 0, "Page is scrolled down");

  var oldY = win.scrollY;

  waitForScrolling = waitForScrollEvent(win);

  synthesizeKey(" ", {shiftKey: true}, win);

  await waitForScrolling;

  ok(win.scrollY < oldY, "Page is scrolled up");

  // Make sure that pressing Space when a tabindex=-1 element is focused

  // will not scroll the page, and will activate the element.

  button.focus();

  await waitToClearOutAnyPotentialScrolls(win);

  var clicked = false;

  button.onclick = () => clicked = true;

  oldY = win.scrollY;

  let waitForNoScroll = waitAndCheckNoScrollEvent(win);

  synthesizeKey(" ", {}, win);

  await waitForNoScroll;

  ok(win.scrollY <= oldY, "Page is not scrolled down");

  ok(clicked, "The button should be clicked");

  synthesizeKey("VK_TAB", {}, win);

  await waitToClearOutAnyPotentialScrolls(win);

  oldY = win.scrollY;

  waitForScrolling = waitForScrollEvent(win);

  synthesizeKey(" ", {}, win);

  await waitForScrolling;

  ok(win.scrollY >= oldY, "Page is scrolled down");

  win.close();

  win = window.open("file_bug915962.html", "_blank",

                    "width=600,height=600,scrollbars=yes");

  SimpleTest.waitForFocus(async function() {

    is(win.scrollY, 0, "Sanity check");

    waitForScrolling = waitForScrollEvent(win);

    synthesizeKey(" ", {}, win);

    await waitForScrolling;

    isnot(win.scrollY, 0, "Page is scrolled down without crashing");

    win.close();

    SimpleTest.finish();

  }, win);

</script>

</pre>

</body>

</html>