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diff --git a/gfx/layers/apz/test/mochitest/helper_hittest_fixed_in_scrolled_transform.html b/gfx/layers/apz/test/mochitest/helper_hittest_fixed_in_scrolled_transform.html
new file mode 100644
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+++ b/gfx/layers/apz/test/mochitest/helper_hittest_fixed_in_scrolled_transform.html
@@ -0,0 +1,91 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Hit-testing on the special setup from fixed-pos-scrolled-clip-3.html</title>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  <meta name="viewport" content="width=device-width"/>
+<style>
+body {
+  margin: 0;
+  height: 4000px;
+}
+
+.transform {
+  transform: translate(10px, 10px);
+  width: 500px;
+}
+
+.subframe {
+  height: 600px;
+  overflow: auto;
+  box-shadow: 0 0 0 2px black;
+}
+
+.scrolled {
+  height: 4000px;
+  position: relative;
+}
+
+.absoluteClip {
+  position: absolute;
+  top: 300px;
+  left: 100px;
+  width: 200px;
+  height: 200px;
+  background: red;
+  clip: rect(auto auto auto auto);
+}
+
+.fixed {
+  position: fixed;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  background: linear-gradient(lime, lime) black 0 100px no-repeat;
+  background-size: 100% 200px;
+}
+</style>
+</head>
+<body>
+<!-- This is lifted from layout/reftests/async-scrolling/fixed-pos-scrolled-clip-3.html -->
+<div class="transform">
+  <div class="subframe">
+    <div class="scrolled">
+      <div class="absoluteClip">
+        <div class="fixed"></div>
+      </div>
+    </div>
+  </div>
+</div>
+</body>
+<script type="application/javascript">
+
+async function test() {
+  var config = getHitTestConfig();
+  var utils = config.utils;
+
+  // layerize the scrollable frame
+  var subframe = document.querySelector(".subframe");
+  utils.setDisplayPortForElement(0, 0, 800, 2000, subframe, 1);
+  await promiseApzFlushedRepaints();
+
+  var target = document.querySelector(".absoluteClip");
+  // The fixed item is fixed with respect to the transform, which is
+  // outside the subframe, so we should scroll the root scroll frame,
+  // not the subframe.
+  checkHitResult(hitTest(centerOf(target)),
+                 APZHitResultFlags.VISIBLE,
+                 utils.getViewId(document.scrollingElement),
+                 utils.getLayersId(),
+                 "fixed item inside a scrolling transform");
+}
+
+waitUntilApzStable()
+.then(test)
+.then(subtestDone, subtestFailed);
+
+</script>
+</html>