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Test Info:

<!DOCTYPE html>
<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>