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<title>Legacy callback interface objects</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
<link rel="help" href="https://heycam.github.io/webidl/#legacy-callback-interface-object">

<script>
test(() => {
  assert_equals(typeof NodeFilter, "function");
}, "Must be a function according to typeof");

test(() => {
  assert_true(Object.get