| <!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> |