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diff --git a/dom/events/test/pointerevents/file_pointercapture_xorigin_iframe.html b/dom/events/test/pointerevents/file_pointercapture_xorigin_iframe.html
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index 0000000000..88690748e5
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+++ b/dom/events/test/pointerevents/file_pointercapture_xorigin_iframe.html
@@ -0,0 +1,62 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1671849
+-->
+<head>
+<title>Bug 1671849</title>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="pointerevent_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=1671849">Mozilla Bug 1671849</a>
+<div id="target"></div>
+<iframe src="https://example.com/tests/dom/events/test/pointerevents/iframe.html"></iframe>
+
+<pre id="test">
+<script type="text/javascript">
+/**
+ * Test for Bug 1671849
+ */
+add_task(async function test_pointer_capture_xorigin_iframe() {
+  let iframe = document.querySelector("iframe");
+  await SpecialPowers.spawn(iframe.contentWindow, [], () => {
+    let unexpected = function(e) {
+      ok(false, `iframe shoule not get any ${e.type} event`);
+    };
+    content.document.body.addEventListener("pointermove", unexpected);
+    content.document.body.addEventListener("pointerup", unexpected);
+  });
+
+  let target = document.getElementById("target");
+  synthesizeMouse(target, 10, 10, { type: "mousedown" });
+  await waitForEvent(target, "pointerdown", function(e) {
+    target.setPointerCapture(e.pointerId);
+  });
+
+  synthesizeMouse(iframe, 10, 10, { type: "mousemove" });
+  await Promise.all([waitForEvent(target, "gotpointercapture"),
+                     waitForEvent(target, "pointermove")]);
+
+  synthesizeMouse(iframe, 10, 10, { type: "mouseup" });
+  await Promise.all([waitForEvent(target, "lostpointercapture"),
+                     waitForEvent(target, "pointerup")]);
+});
+</script>
+</pre>
+</body>
+</html>