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diff --git a/dom/tests/mochitest/pointerlock/file_pointerlock_xorigin_iframe_no_user_gesture.html b/dom/tests/mochitest/pointerlock/file_pointerlock_xorigin_iframe_no_user_gesture.html
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index 0000000000..68977ffada
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+++ b/dom/tests/mochitest/pointerlock/file_pointerlock_xorigin_iframe_no_user_gesture.html
@@ -0,0 +1,95 @@
+<!DOCTYPE HTML>
+<html>
+<!--https://bugzilla.mozilla.org/show_bug.cgi?id=1672330-->
+<head>
+<title>Bug 1672330</title>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/paint_listener.js"></script>
+<script src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
+<script src="pointerlock_utils.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+<style>
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+iframe {
+  width: 400px;
+  height: 300px;
+  border: 1px solid blue;
+}
+</style>
+</head>
+<body>
+<a target="_blank"href="https://bugzilla.mozilla.org/show_bug.cgi?id=1672330">Mozilla Bug 1672330</a>
+<div id="target"></div>
+<iframe src="https://example.com/tests/dom/tests/mochitest/pointerlock/iframe_differentDOM.html"></iframe>
+
+<pre id="test">
+<script type="text/javascript">
+/**
+ * Test for Bug 1672330
+ */
+SimpleTest.waitForExplicitFinish();
+
+async function requestPointerLock(aElement, aExpectError = false) {
+  let doc = aElement.ownerDocument;
+  let waitForPointerLockEvent = function() {
+    return new Promise((aResolve) => {
+      let eventHandler = function(aEvent) {
+        is(aEvent.type, aExpectError ? 'pointerlockerror' : 'pointerlockchange',
+           `got ${aEvent.type}`);
+        doc.removeEventListener('pointerlockchange', eventHandler);
+        doc.removeEventListener('pointerlockerror', eventHandler);
+        aResolve();
+      };
+
+      doc.addEventListener('pointerlockchange', eventHandler);
+      doc.addEventListener('pointerlockerror', eventHandler);
+    });
+  };
+
+  aElement.requestPointerLock();
+  await waitForPointerLockEvent();
+  is(doc.pointerLockElement, aExpectError ? null : aElement, "target pointer locked");
+}
+
+async function start() {
+  await waitUntilApzStable();
+
+  let target = document.getElementById("target");
+  SpecialPowers.wrap(document).clearUserGestureActivation();
+  // Pointer lock request should be rejected due to the lack of user gesture.
+  await requestPointerLock(target, true);
+
+  // Test mouse event should not be dispatched to document.
+  document.addEventListener("mousemove", function(e) {
+    ok(false, "Got unexpected mousemove");
+  });
+
+  info("test sending mouse event to iframe");
+  let iframe = document.querySelector("iframe");
+  synthesizeMouse(iframe, 10, 10, { type: "mousemove" });
+  await new Promise(resolve => { SimpleTest.executeSoon(resolve); });
+
+  info("test sending mouse event to another window");
+  await new Promise((aResolve) => {
+    let win = window.open("iframe_differentDOM.html");
+    win.addEventListener("load", async function() {
+      info("win onload");
+      await waitUntilApzStable();
+      synthesizeMouse(win.document.body, 10, 10, { type: "mousemove" }, win);
+      win.close();
+      aResolve();
+    });
+  });
+  await new Promise(resolve => { SimpleTest.executeSoon(resolve); });
+
+  SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>