src/third_party/web_platform_tests/notifications/event-onclick-manual.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Notification.onclick (basic)</title>
<link rel="author" title="Apple Inc." href="http://www.apple.com/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="common.js"></script>
<script>
setup({ explicit_timeout: true })
if (hasNotificationPermission()) {
    async_test(function (t) {
        t.step(function () {
            var notification =
                new Notification("Please click on the notification.", {
                    body: "Click me to test clicking on notifications."
                })
            notification.onclick = function(e) {
                assert_equals(Object.prototype.toString.call(e), "[object Event]")
                assert_equals(e.type, "click")
                t.done()
            }
        })
    })
}
</script>