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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=422132
+-->
+<head>
+  <title>Test for Bug 422132</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <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>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=422132">Mozilla Bug 422132</a>
+<p id="display"></p>
+<div id="target" style="font-size: 0; width: 200px; height: 200px; overflow: auto;">
+  <div style="width: 1000px; height: 1000px;"></div>
+</div>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 422132 **/
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  SpecialPowers.pushPrefEnv({
+    "set":[["general.smoothScroll", false],
+           ["mousewheel.min_line_scroll_amount", 1],
+           ["mousewheel.system_scroll_override.enabled", false],
+           ["mousewheel.transaction.timeout", 100000],
+           ["test.events.async.enabled", true]]}, runTests)}, window);
+
+function runTests()
+{
+  var target = document.getElementById("target");
+
+  var scrollLeft = target.scrollLeft;
+  var scrollTop = target.scrollTop;
+
+  var tests = [
+    {
+      prepare() {
+        scrollLeft = target.scrollLeft;
+        scrollTop = target.scrollTop;
+      },
+      event: {
+        deltaMode: WheelEvent.DOM_DELTA_PIXEL,
+        deltaX: 0.5,
+        deltaY: 0.5,
+        lineOrPageDeltaX: 0,
+        lineOrPageDeltaY: 0
+      },
+    }, {
+      event: {
+        deltaMode: WheelEvent.DOM_DELTA_PIXEL,
+        deltaX: 0.5,
+        deltaY: 0.5,
+        lineOrPageDeltaX: 0,
+        lineOrPageDeltaY: 0
+      },
+      check() {
+        is(target.scrollLeft - scrollLeft, 1,
+           "not scrolled to right by 0.5px delta value with pending 0.5px delta");
+        is(target.scrollTop - scrollTop, 1,
+           "not scrolled to bottom by 0.5px delta value with pending 0.5px delta");
+      },
+    }, {
+      prepare() {
+        scrollLeft = target.scrollLeft;
+        scrollTop = target.scrollTop;
+      },
+      event: {
+        deltaMode: WheelEvent.DOM_DELTA_LINE,
+        deltaX: 0.5,
+        deltaY: 0.5,
+        lineOrPageDeltaX: 0,
+        lineOrPageDeltaY: 0
+      },
+    }, {
+      event: {
+        deltaMode: WheelEvent.DOM_DELTA_LINE,
+        deltaX: 0.5,
+        deltaY: 0.5,
+        lineOrPageDeltaX: 1,
+        lineOrPageDeltaY: 1
+      },
+      check() {
+        is(target.scrollLeft - scrollLeft, 1,
+           "not scrolled to right by 0.5 line delta value with pending 0.5 line delta");
+        is(target.scrollTop - scrollTop, 1,
+           "not scrolled to bottom by 0.5 line delta value with pending 0.5 line delta");
+      }
+    }
+  ];
+
+  var nextTest = function() {
+    var test = tests.shift();
+    if (test.prepare) {
+      test.prepare();
+    }
+
+    sendWheelAndPaint(target, 10, 10, test.event, function() {
+      if (test.check) {
+        test.check();
+      }
+      if (!tests.length) {
+        SimpleTest.finish();
+        return;
+      }
+
+      setTimeout(nextTest, 0);
+    });
+  }
+
+  nextTest();
+}
+
+</script>
+</pre>
+</body>
+</html>