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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async t => {
assert_implements("HTMLPortalElement" in self);
let activatePromise = document.createElement('portal').activate();
await promise_rejects_dom(t, 'InvalidStateError', activatePromise);
}, "A portal with nothing in it cannot be activated");
</script>
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