CustomElementRegistry-multi-register.tentative.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /custom-elements/scoped-registry/CustomElementRegistry-multi-register.tentative.html - WPT Dashboard Interop Dashboard

<!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>