<!DOCTYPE html>
<meta name="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org">
<meta name="assert" content="The same constructor can be registered to multiple registries">
<link rel="help" href="https://wicg.github.io/webcomponents/proposals/Scoped-Custom-Element-Registries">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
class MyCustom extends HTMLElement {};

test(() => {
  let registry1 = new CustomElementRegistry();
  let registry2 = new CustomElementRegistry();
  window.customElements.define('my-custom', MyCustom);
  registry1.define('my-custom', MyCustom);
  registry2.define('my-custom', MyCustom);

  assert_equals(window.customElements.get('my-custom'), MyCustom);
  assert_equals(registry1.get('my-custom'), MyCustom);
  assert_equals(registry2.get('my-custom'), MyCustom);
}, 'Same constructor can be registered to different registries');

test(() => {
  let registry = new CustomElementRegistry();
  registry.define('custom-a', MyCustom);
  assert_throws_dom('NotSupportedError', () => registry.define('custom-b', MyCustom));
}, 'Non-global registries still reject duplicate registrations of the same constructor');
</script>
