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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test scrolling flattened inactive frames</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+<style>
+p {
+  width:200px;
+  height:200px;
+  border:solid 1px black;
+  overflow:auto;
+}
+</style>
+</head>
+<body>
+<div id="iframe-body" style="overflow: auto; height: 1000px">
+<hr>
+<hr>
+<hr>
+<p>
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+</p><p>
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+</p>
+</div>
+<script clss="testbody" type="text/javascript">
+function ScrollTops() {
+  this.outerScrollTop = document.getElementById("iframe-body").scrollTop;
+  this.innerScrollTop = document.getElementById("subframe").scrollTop;
+}
+
+var DefaultEvent = {
+  deltaMode: WheelEvent.DOM_DELTA_LINE,
+  deltaX: 0, deltaY: 1,
+  lineOrPageDeltaX: 0, lineOrPageDeltaY: 1,
+};
+
+async function test() {
+  var subframe = document.getElementById("subframe");
+  var oldpos = new ScrollTops();
+  await new Promise(resolve => {
+    sendWheelAndPaint(subframe, 10, 10, DefaultEvent, resolve);
+  });
+
+  var newpos = new ScrollTops();
+  ok(oldpos.outerScrollTop == newpos.outerScrollTop, "viewport should not have scrolled");
+  ok(oldpos.innerScrollTop != newpos.innerScrollTop, "subframe should have scrolled");
+  oldpos = newpos;
+
+  // Scroll outer
+  var outer = document.getElementById("iframe-body");
+  await new Promise(resolve => {
+    sendWheelAndPaint(outer, 20, 5, DefaultEvent, resolve);
+  });
+
+  newpos = new ScrollTops();
+  ok(oldpos.outerScrollTop != newpos.outerScrollTop, "viewport should have scrolled");
+  ok(oldpos.innerScrollTop == newpos.innerScrollTop, "subframe should not have scrolled");
+  oldpos = newpos;
+
+  // Scroll inner again
+  // Tick the refresh driver once to make sure the compositor has sent the
+  // updated scroll offset for the outer scroller to WebRender, so that the
+  // hit-test in sendWheelAndPaint takes it into account. (This isn't needed
+  // if using non-WR layers, but doesn't hurt either).
+  var dwu = SpecialPowers.getDOMWindowUtils(window);
+  dwu.advanceTimeAndRefresh(16);
+  dwu.restoreNormalRefresh();
+
+  await new Promise(resolve => {
+    sendWheelAndPaint(subframe, 10, 10, DefaultEvent, resolve);
+  });
+
+  newpos = new ScrollTops();
+  ok(oldpos.outerScrollTop == newpos.outerScrollTop, "viewport should not have scrolled");
+  ok(oldpos.innerScrollTop != newpos.innerScrollTop, "subframe should have scrolled");
+}
+
+SimpleTest.waitForExplicitFinish();
+
+pushPrefs([["general.smoothScroll", false],
+           ["mousewheel.transaction.timeout", 0],
+           ["mousewheel.transaction.ignoremovedelay", 0],
+           ["test.events.async.enabled", true]])
+.then(waitUntilApzStable)
+.then(test)
+.then(SimpleTest.finish, SimpleTest.finishWithFailure);
+
+</script>
+</body>
+</html>