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diff --git a/gfx/layers/apz/test/mochitest/helper_hittest_iframe_perspective-3.html b/gfx/layers/apz/test/mochitest/helper_hittest_iframe_perspective-3.html
new file mode 100644
index 0000000000..7fb423ca1c
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+++ b/gfx/layers/apz/test/mochitest/helper_hittest_iframe_perspective-3.html
@@ -0,0 +1,70 @@
+<head>
+  <meta name="viewport" content="width=device-width; initial-scale=1.0">
+  <title>Test that events are delivered with correct coordinates to an iframe inide a perspective transform</title>
+  <script src="apz_test_native_event_utils.js"></script>
+  <script src="apz_test_utils.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  <style>
+  html, body {
+    margin: 0;
+    padding: 0;
+  }
+  #outer {
+    margin-top: 50px;
+    margin-left: 50px;
+    perspective: 500px;
+  }
+  #inner {
+    transform: translate3d(0,0,-100px);
+    transform-style: preserve-3d;
+  }
+  iframe {
+    border: 0;
+    background-color: blue;
+    transform: translate3d(0,0,100px);
+  }
+  </style>
+</head>
+<body>
+  <div id="outer">
+    <div id="inner">
+      <iframe id="iframe" src="https://example.com/tests/gfx/layers/apz/test/mochitest/helper_hittest_iframe_perspective_child.html"></iframe>
+    </div>
+  </div>
+  <script type="application/javascript">
+async function test() {
+  // Wait for iframe to receive content transforms.
+  await SpecialPowers.spawn(iframe, [], async () => {
+    await SpecialPowers.contentTransformsReceived(content.window);
+  });
+
+  let clickCoordsInChild = {
+    offsetX: 0,
+    offsetY: 0
+  };
+  let childMessagePromise = new Promise(resolve => {
+    window.addEventListener("message", event => {
+      let data = JSON.parse(event.data);
+      if ("type" in data && data.type == "got-mouse-down") {
+        clickCoordsInChild = data.coords;
+        resolve();
+      }
+    })
+  });
+  await synthesizeNativeMouseEventWithAPZ({
+    type: "click",
+    target: outer,
+    offsetX: 100,
+    offsetY: 100
+  });
+  await childMessagePromise;
+  is(clickCoordsInChild.offsetX, 100, "x coordinate is correct");
+  is(clickCoordsInChild.offsetY, 100, "y coordinate is correct");
+}
+
+waitUntilApzStable()
+.then(test)
+.then(subtestDone, subtestFailed);
+
+  </script>
+</body>