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diff --git a/testing/web-platform/tests/html/user-activation/user-activation-interface.html b/testing/web-platform/tests/html/user-activation/user-activation-interface.html
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+++ b/testing/web-platform/tests/html/user-activation/user-activation-interface.html
@@ -0,0 +1,32 @@
+<!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 src="resources/utils.js"></script>
+</head>
+<body onload="runTests()">
+  <h1>Basic test for navigator.userActivation interface</h1>
+  <p>Tests that navigator.userActivation shows user activation states.</p>
+  <ol id="instructions">
+    <li>Click anywhere in the document.
+  </ol>
+  <script>
+  function runTests() {
+    promise_test(async () => {
+        assert_true(!!navigator.userActivation, "This test requires navigator.userActivation API");
+
+        assert_false(navigator.userActivation.hasBeenActive, "No sticky activation before click");
+        assert_false(navigator.userActivation.isActive, "No transient activation before click");
+
+        await test_driver.click(document.body);
+
+        assert_true(navigator.userActivation.hasBeenActive, "Has sticky activation after click");
+        assert_true(navigator.userActivation.isActive, "Has transient activation after click");
+    }, "navigator.userActivation shows correct states before/after a click");
+  }
+  </script>
+</body>
+</html>