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chromium/third_party/blink/web_tests/external/wpt/html/user-activation/message-event-init.tentative.html 

<!DOCTYPE html>
<!--
   Tentative due to:
   https://github.com/whatwg/html/issues/1983
-->
<title>MessageEvent constructor</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
  var ev = new MessageEvent("test", { userActivation: navigator.userActivation })
  assert_equals(ev.userActivation, navigator.userActivation, "userActivation attribute")
}, "MessageEventInit user activation set")
test(function() {
  var ev = new MessageEvent("test")
  assert_equals(ev.userActivation, null, "userActivation attribute")
}, "MessageEventInit user activation not set")

</script>