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diff --git a/gfx/layers/apz/test/mochitest/helper_drag_click.html b/gfx/layers/apz/test/mochitest/helper_drag_click.html
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+++ b/gfx/layers/apz/test/mochitest/helper_drag_click.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width; initial-scale=1.0">
+  <title>Sanity mouse-drag click test</title>
+  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  <script type="application/javascript">
+
+async function test() {
+  let clickPromise = new Promise(resolve => {
+    document.addEventListener("click", resolve);
+  });
+
+  // Ensure the pointer is inside the window
+  await promiseNativeMouseEventWithAPZ({
+    target: document.getElementById("b"),
+    offsetX: 5,
+    offsetY: 5,
+    type: "mousemove",
+  });
+  // mouse down, move it around, and release it near where it went down. this
+  // should generate a click at the release point
+  await promiseNativeMouseEventWithAPZ({
+    target: document.getElementById("b"),
+    offsetX: 5,
+    offsetY: 5,
+    type: "mousedown",
+  });
+  await promiseNativeMouseEventWithAPZ({
+    target: document.getElementById("b"),
+    offsetX: 100,
+    offsetY: 100,
+    type: "mousemove",
+  });
+  await promiseNativeMouseEventWithAPZ({
+    target: document.getElementById("b"),
+    offsetX: 10,
+    offsetY: 10,
+    type: "mousemove",
+  });
+  await promiseNativeMouseEventWithAPZ({
+    target: document.getElementById("b"),
+    offsetX: 8,
+    offsetY: 8,
+    type: "mouseup",
+  });
+  dump("Finished synthesizing click with a drag in the middle\n");
+
+  let e = await clickPromise;
+  // The mouse down at (5, 5) should not have generated a click, but the up
+  // at (8, 8) should have.
+  is(e.target, document.getElementById("b"), "Clicked on button, yay! (at " + e.clientX + "," + e.clientY + ")");
+  is(e.clientX, 8 + Math.floor(document.getElementById("b").getBoundingClientRect().left), "x-coord of click event looks sane");
+  is(e.clientY, 8 + Math.floor(document.getElementById("b").getBoundingClientRect().top), "y-coord of click event looks sane");
+}
+
+waitUntilApzStable()
+.then(test)
+.then(subtestDone, subtestFailed);
+
+  </script>
+</head>
+<body>
+ <button id="b" style="width: 10px; height: 10px; padding: 0;"></button>
+</body>
+</html>