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@webcomponents/custom-elements

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<!DOCTYPE html> <script src="../../resources/testharness.js"></script> <script src="../../resources/testharnessreport.js"></script> <script src="../spec/resources/custom-elements-helpers.js"></script> <link id="import1" rel="import" href="resources/async-component.html" async> <a-a></a-a> <script> 'use strict'; promise_test(() => { return customElements.whenDefined('a-a').then(() => { let a = document.querySelector('a-a'); assert_is_upgraded(a, AsyncComponent, '<async-component> in this document should have been upgraded.'); let b = import1.import.querySelector('a-a'); assert_is_upgraded(b, AsyncComponent, '<async-component> in imported document should have been upgraded.'); }); }, 'custom elements definition in async import should work.'); </script>