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diff --git a/testing/web-platform/tests/fullscreen/api/element-request-fullscreen-two-elements.html b/testing/web-platform/tests/fullscreen/api/element-request-fullscreen-two-elements.html
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+++ b/testing/web-platform/tests/fullscreen/api/element-request-fullscreen-two-elements.html
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+<!DOCTYPE html>
+<title>Element#requestFullscreen() on two elements in the same document</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="../trusted-click.js"></script>
+<body>
+    <div id="a"></div>
+    <div id="b"></div>
+</body>
+<script>
+    promise_test(async (t) => {
+        document.onfullscreenerror = t.unreached_func("fullscreenerror event");
+
+        // Request fullscreen on both elements, but in reverse tree order.
+        const a = document.getElementById("a");
+        const b = document.getElementById("b");
+
+        // Expect two fullscreenchange events, with document.fullscreenElement
+        // changing in the same order as the requests.
+        await trusted_click(b);
+        await Promise.all([b.requestFullscreen(), fullScreenChange()]);
+        assert_equals(document.fullscreenElement, b);
+
+        await trusted_click(b);
+        await Promise.all([a.requestFullscreen(), fullScreenChange()]);
+        assert_equals(document.fullscreenElement, a);
+    }, "Element#requestFullscreen() on two elements in the same document");
+</script>