diff --git a/testing/web-platform/tests/long-animation-frame/tentative/loaf-event-blocking-duration.html b/testing/web-platform/tests/long-animation-frame/tentative/loaf-event-blocking-duration.html
new file mode 100644
index 0000000000000..daa5f64c39e3a
--- /dev/null
+++ b/testing/web-platform/tests/long-animation-frame/tentative/loaf-event-blocking-duration.html
@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Long Animation Frame Timing: blocking duration with events</title>
+<meta name="timeout" content="long">
+<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/testdriver-actions.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<h1>Long Animation Frame: blocking duration with events</h1>
+<div id="log"></div>
+<output id="output"></output>
+<script>
+promise_test(async t => {
+  const [entry, script] = await expect_long_frame_with_script(async () => {
+    const button = document.createElement("button");
+    button.innerText = "click";
+    button.addEventListener("click", () => busy_wait());
+    document.body.append(button);
+    t.add_cleanup(() => button.remove());
+    await test_driver.click(button);
+  }, (script) => script.name === "BUTTON.onclick", t);
+  assert_greater_than(entry.duration, 50);
+  assert_greater_than_equal(entry.blockingDuration, 300);
+}, "LoAF generated by events should generate correct blockingDuration");
+</script>
+</body>
