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products/sources/formale Sprachen/C/Firefox/dom/events/test/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 182 kB

Quelle window_wheel_default_action.html Sprache: HTML

products/sources/formale Sprachen/C/Firefox/dom/events/test/window_wheel_default_action.html

<!DOCTYPE HTML>
<html>
<head>
  <title>Test for default action of WheelEvent</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/SimpleTest/EventUtils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<p id="display"></p>
<div id="scrollable" style="overflow: auto; width: 200px; height: 200px;">
  <div id="clipper" style="margin: 0; padding: 0; overflow: hidden; width: 3000px; height: 3000px;">
    <div id="scrolled" style="width: 5000px; height: 5000px;">
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      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
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      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
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      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
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      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    </div>
  </div>
</div>
<div id="spacerForBody"></div>
<div id="content" style="display: none">

</div>
<pre id="test">
<script type="application/javascript">

// Until the first non-blank paint, the parent will set the opacity of our
// browser to 0 using the 'blank' attribute.
// Until the blank attribute is removed, we can't send scroll events.
SimpleTest.waitForFocus(function() {
  let chromeScript = SpecialPowers.loadChromeScript(_ => {
    /* eslint-env mozilla/chrome-script */
    let win = Services.wm.getMostRecentWindow("navigator:browser");
    win.requestAnimationFrame(() => {
      win.gBrowser.selectedBrowser.removeAttribute("blank");
      win.requestAnimationFrame(() => {
        sendAsyncMessage("blank-attribute-removed");
      });
    });
  });
  chromeScript.promiseOneMessage("blank-attribute-removed").then(() => {
    chromeScript.destroy();
    runTests();
  });
}, window);

SimpleTest.requestLongerTimeout(6);
SimpleTest.requestFlakyTimeout("untriaged");

var winUtils = SpecialPowers.getDOMWindowUtils(window);
// grab refresh driver
winUtils.advanceTimeAndRefresh(100);

var gScrollableElement = document.getElementById("scrollable");
var gScrolledElement = document.getElementById("scrolled");
var gSpacerForBodyElement = document.getElementById("spacerForBody");

const kDefaultActionNone                 = 0;
const kDefaultActionScroll               = 1;
const kDefaultActionHistory              = 2;
const kDefaultActionZoom                 = 3;
const kDefaultActionHorizontalizedScroll = 4;

const kDefaultActionOverrideXNoOverride = -1;
const kDefaultActionOverrideXNone       = kDefaultActionNone;
const kDefaultActionOverrideXScroll     = kDefaultActionScroll;
const kDefaultActionOverrideXHistory    = kDefaultActionHistory;
const kDefaultActionOverrideXZoom       = kDefaultActionZoom;

// We sometimes rely on the scroll position not getting preserved across tests.
function resetScrollPosition(element) {
  element.style.display = "none";
  element.offsetTop;
  element.style.display = "";
}

function is()
{
  window.opener.is.apply(window.opener, arguments);
}

function ok()
{
  window.opener.ok.apply(window.opener, arguments);
}

function sendWheelAndWait(aX, aY, aEvent, aCallback)
{
  sendWheelAndPaint(gScrollableElement, aX, aY, aEvent, aCallback);
}

function hitEventLoop(aFunc, aTimes)
{
  winUtils.advanceTimeAndRefresh(100);

  if (--aTimes) {
    setTimeout(hitEventLoop, 0, aFunc, aTimes);
  } else {
    setTimeout(aFunc, 20);
  }
}

function onZoomReset(aCallback) {
  var fullZoom = SpecialPowers.getFullZoom(window);
  if (fullZoom == 1) {
    SimpleTest.executeSoon(aCallback);
    return;
  }
  // Zoom causes a resize of the viewport.
  window.addEventListener("resize", function onResize(event) {
    is(SpecialPowers.getFullZoom(window), 1, "Zoom should be reset to 1");
    window.removeEventListener("resize", onResize);
    SimpleTest.executeSoon(aCallback);
  });
}

function setDeltaMultiplierSettings(aSettings, aCallback)
{
  SpecialPowers.pushPrefEnv({"set": [
    ["mousewheel.default.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.default.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.default.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_alt.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_alt.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_alt.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_control.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_control.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_control.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_meta.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_meta.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_meta.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_shift.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_shift.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_shift.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
   ]}, aCallback);
}

function doTestScroll(aSettings, aCallback)
{
  const kNoScroll    = 0x00;
  const kScrollUp    = 0x01;
  const kScrollDown  = 0x02;
  const kScrollLeft  = 0x04;
  const kScrollRight = 0x08;

  const kTests = [
    { description: "Scroll to bottom by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by pixel scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by pixel scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by pixel scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by pixel scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by pixel scroll for z",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },

    { description: "Scroll to bottom by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by line scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by line scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by line scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by line scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by line scroll for z",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },

    { description: "Scroll to bottom by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by page scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by page scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by page scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by page scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by page scroll for z",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },

    // special cases.

    // momentum scroll should cause scroll even if the action is zoom, but if the default action is none,
    // shouldn't do it.
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is -1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is -1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by momentum pixel scroll for z (action is zoom)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Not Scroll by momentum pixel scroll if default action is none (action is zoom)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false },
      expected: kNoScroll,
      prepare (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 0]]}, cb); },
      cleanup (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 1]]}, cb); } },

    // momentum scroll should cause scroll even if the action is history, but if the default action is none,
    // shouldn't do it.
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is -1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is -1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by momentum pixel scroll for z (action is history)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kNoScroll },
    { description: "Not Scroll by momentum pixel scroll if default action is none (action is history)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: true, metaKey: false },
      expected: kNoScroll,
      prepare (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 0]]}, cb); },
      cleanup (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 1]]}, cb); } },

    // Don't scroll along axis whose overflow style is hidden.
    { description: "Scroll to only bottom by oblique pixel wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown,
      prepare(cb) { gScrollableElement.style.overflowX = "hidden"; cb(); } },
    { description: "Scroll to only bottom by oblique line wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to only bottom by oblique page wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to only top by oblique pixel wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique line wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique page wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp,
      cleanup (cb) { gScrollableElement.style.overflowX = "auto"; cb(); } },
    { description: "Scroll to only right by oblique pixel wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight,
      prepare(cb) { gScrollableElement.style.overflowY = "hidden"; cb(); } },
    { description: "Scroll to only right by oblique line wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to only right by oblique page wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to only left by oblique pixel wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique line wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique page wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft,
      cleanup (cb) { gScrollableElement.style.overflowY = "auto"; cb(); } },
    { description: "Don't be scrolled by oblique pixel wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll,
      prepare(cb) { gScrollableElement.style.overflow = "hidden"; cb(); } },
    { description: "Don't be scrolled by oblique line wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique page wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique pixel wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique line wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique page wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll,
      cleanup (cb) { gScrollableElement.style.overflow = "auto"; cb(); } },

    // Don't scroll along axis whose overflow style is hidden and overflow delta values should
    // be zero if there is ancestor scrollable element.
    { description: "Scroll to only bottom by oblique pixel wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown,
      prepare(cb) {
        gScrollableElement.style.overflowX = "hidden";
        gScrollableElement.style.position = "fixed";
        gScrollableElement.style.top = "30px";
        gScrollableElement.style.left = "30px";
        // Make body element scrollable.
        gSpacerForBodyElement.style.width = "5000px";
        gSpacerForBodyElement.style.height = "5000px";
        document.documentElement.scrollTop = 500;
        document.documentElement.scrollLeft = 500;
        cb();
      } },
    { description: "Scroll to only bottom by oblique line wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to only bottom by oblique page wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollDown },
    { description: "Scroll to only top by oblique pixel wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique line wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique page wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollUp,
      cleanup (cb) { gScrollableElement.style.overflowX = "auto"; cb(); } },
    { description: "Scroll to only right by oblique pixel wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight,
      prepare(cb) { gScrollableElement.style.overflowY = "hidden"; cb(); } },
    { description: "Scroll to only right by oblique line wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to only right by oblique page wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to only left by oblique pixel wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique line wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique page wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft,
      cleanup (cb) {
        gScrollableElement.style.overflowY = "auto";
        gScrollableElement.style.position = "static";
        gSpacerForBodyElement.style.width = "";
        gSpacerForBodyElement.style.height = "";
        cb();
      } },
  ];

  var description;

  var currentTestIndex = -1;
  var isXReverted = (aSettings.deltaMultiplierX < 0);
  var isYReverted = (aSettings.deltaMultiplierY < 0);

  function doNextTest()
  {
    if (++currentTestIndex >= kTests.length) {
      SimpleTest.executeSoon(aCallback);
      return;
    }

    gScrollableElement.scrollTop = 1000;
    gScrollableElement.scrollLeft = 1000;

    var currentTest = kTests[currentTestIndex];
    description = "doTestScroll(aSettings=" + aSettings.description + "), " + currentTest.description + ": ";
    if (currentTest.prepare) {
      // prepare() can make changes to a page such as
      // changing the 'overflow' property which requires
      // a repaint to take effect before sending
      // scroll-wheel events.
      currentTest.prepare(doWaitForPaintsAndScroll);
    } else {
      doTestCurrentScroll();
    }
  }

  function doWaitForPaintsAndScroll() {
   waitForAllPaintsFlushed(doTestCurrentScroll);
  }

  function doTestCurrentScroll() {
    var currentTest = kTests[currentTestIndex];
    sendWheelAndWait(10, 10, currentTest.event, function () {
      if (currentTest.expected == kNoScroll) {
        is(gScrollableElement.scrollTop, 1000, description + "scrolled vertical");
        is(gScrollableElement.scrollLeft, 1000, description + "scrolled horizontal");
      } else {
        var scrollUp = !isYReverted ? (currentTest.expected & kScrollUp) :
                                      (currentTest.expected & kScrollDown);
        var scrollDown = !isYReverted ? (currentTest.expected & kScrollDown) :
                                        (currentTest.expected & kScrollUp);
        if (scrollUp) {
          ok(gScrollableElement.scrollTop < 1000, description + "not scrolled up, got " + gScrollableElement.scrollTop);
        } else if (scrollDown) {
          ok(gScrollableElement.scrollTop > 1000, description + "not scrolled down, got " + gScrollableElement.scrollTop);
        } else {
          is(gScrollableElement.scrollTop, 1000, description + "scrolled vertical");
        }
        var scrollLeft = !isXReverted ? (currentTest.expected & kScrollLeft) :
                                        (currentTest.expected & kScrollRight);
        var scrollRight = !isXReverted ? (currentTest.expected & kScrollRight) :
                                         (currentTest.expected & kScrollLeft);
        if (scrollLeft) {
          ok(gScrollableElement.scrollLeft < 1000, description + "not scrolled to left, got " + gScrollableElement.scrollLeft);
        } else if (scrollRight) {
          ok(gScrollableElement.scrollLeft > 1000, description + "not scrolled to right, got " + gScrollableElement.scrollLeft);
        } else {
          is(gScrollableElement.scrollLeft, 1000, description + "scrolled horizontal");
        }
      }
      if (currentTest.cleanup) {
        currentTest.cleanup(nextStep);
      } else {
        nextStep();
      }

      function nextStep() {
        winUtils.advanceTimeAndRefresh(100);
        doNextTest();
      }
    });
  }
  doNextTest();
}

function doTestHorizontalizedScroll(aSettings, aCallback)
{
  const kNoScroll    = 0x00;
  const kScrollLeft  = 0x01;
  const kScrollRight = 0x02;

  const kTests = [
    { description: "Scroll to right by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by pixel scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by pixel scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Don't scroll by deltaX (pixel scroll, lineOrPageDelta is 0)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Don't scroll by deltaX (pixel scroll, lineOrPageDelta is 1)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Don't scroll by negative deltaX (pixel scroll, lineOrPageDelta is 0)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Don't scroll by negative deltaX (pixel scroll, lineOrPageDelta is -1)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },
    { description: "Scroll only to right by diagonal pixel scroll (to bottom-right)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll only to right by diagonal pixel scroll (to bottom-left)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll only to left by diagonal pixel scroll (to top-left)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll only to left by pixel scroll (to bottom-right)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Don't scroll by pixel scroll for z-axis",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kNoScroll },

    { description: "Scroll to right by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by line scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by line scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false },
      expected: kScrollLeft },
    { description: "Don't scroll by deltaX (line scroll, lineOrPageDelta is 0)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
--> --------------------

--> maximum size reached

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Messung V0.5

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