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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=607464
+-->
+<head>
+ <title>Test for Bug 607464</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+ <script type="text/javascript" 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>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=607464">Mozilla Bug 607464</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript;version=1.7">
+
+/**
+ * Test for Bug 607464:
+ * Pixel scrolling shouldn't scroll smoothly, even if general.smoothScroll is on.
+ **/
+
+function scrollDown150PxWithPixelScrolling(scrollbox) {
+ var win = scrollbox.ownerDocument.defaultView;
+ let event = {
+ deltaMode: WheelEvent.DOM_DELTA_PIXEL,
+ deltaY: 30.0,
+ lineOrPageDeltaY: 1
+ };
+ // A pixel scroll with lineOrPageDeltaY.
+ synthesizeWheel(scrollbox, 10, 10, event, win);
+ // then 4 pixel scrolls without lineOrPageDeltaY.
+ event.lineOrPageDeltaY = 0;
+ for (let i = 0; i < 4; ++i) {
+ synthesizeWheel(scrollbox, 10, 10, event, win);
+ }
+
+ // Note: the line scroll shouldn't have any effect because it has
+ // hasPixels = true set on it. We send it to emulate normal
+ // behavior.
+}
+
+function runTest() {
+ var win = open('data:text/html,<!DOCTYPE html>\n' +
+ '<div id="scrollbox" style="height: 100px; overflow: auto;">' +
+ ' <div style="height: 1000px;"></div>' +
+ '</div>', '_blank', 'width=300,height=300');
+ SimpleTest.waitForFocus(function () {
+ var scrollbox = win.document.getElementById("scrollbox");
+ let scrollTopBefore = scrollbox.scrollTop;
+
+ win.addEventListener("scroll", function(e) {
+ is(scrollbox.scrollTop % 30, 0,
+ "Pixel scrolling should happen instantly, not smoothly. The " +
+ "scroll position " + scrollbox.scrollTop + " in this sequence of wheel " +
+ "events should be a multiple of 30.");
+ if (scrollbox.scrollTop == 150) {
+ win.close();
+ SimpleTest.finish();
+ }
+ }, true);
+
+ flushApzRepaints(function() {
+ scrollDown150PxWithPixelScrolling(scrollbox);
+ }, win);
+ }, win);
+}
+
+window.onload = function() {
+ SpecialPowers.pushPrefEnv({
+ "set":[["general.smoothScroll", true],
+ ["mousewheel.acceleration.start", -1],
+ ["mousewheel.system_scroll_override_on_root_content.enabled", false]]}, runTest);
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.testInChaosMode();
+
+</script>
+</pre>
+
+</body>
+</html>