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diff --git a/testing/web-platform/tests/html/user-activation/chained-setTimeout.html b/testing/web-platform/tests/html/user-activation/chained-setTimeout.html
new file mode 100644
index 0000000000..a530837392
--- /dev/null
+++ b/testing/web-platform/tests/html/user-activation/chained-setTimeout.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <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>
+    let chained_timeout_test = async_test("Chained setTimeout test");
+
+    const max_call_depth = 3;
+    const delay_ms = 10;
+
+    function testInitialStates(depth) {
+        assert_true(1 <= depth && depth <= max_call_depth);
+
+        chained_timeout_test.step_timeout(() => {
+            let test_name = "Call-depth=" + depth + ": initial activation states are false";
+            test(() => {
+                assert_false(navigator.userActivation.isActive);
+                assert_false(navigator.userActivation.hasBeenActive);
+            }, test_name);
+
+            if (depth < max_call_depth)
+                testInitialStates(depth+1);
+            else
+                test_driver.click(document.body);
+        }, delay_ms);
+    }
+
+    function testFinalStates(depth) {
+        assert_true(1 <= depth && depth <= max_call_depth);
+
+        chained_timeout_test.step_timeout(() => {
+            let test_name = "Call-depth=" + depth + ": after-click activation states are true";
+            test(() => {
+                assert_true(navigator.userActivation.isActive);
+                assert_true(navigator.userActivation.hasBeenActive);
+            }, test_name);
+
+            if (depth < max_call_depth)
+                testFinalStates(depth+1);
+            else
+                chained_timeout_test.done();
+        }, delay_ms)
+    }
+
+    function run() {
+        window.addEventListener("click", event => {
+            testFinalStates(1);
+        });
+
+        testInitialStates(1);
+    }
+  </script>
+</head>
+<body onload="run()">
+  <h1>User activation state in chained setTimeout calls</h1>
+  <p>Tests that user activation state is visible in arbitrary call depth of setTimeout.</p>
+  <ol id="instructions">
+    <li>Click anywhere in the document.
+  </ol></body>
+</html>