embedder-custom-elements-not-exposed.html

<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>
'use strict';

// The embedder may define its own elements via the CustomElementRegistry
// whose names are not valid custom element names. Ensure that script does
// not have access to such names.
var embedderName = 'embeddercustomelement';
window.internals.addEmbedderCustomElementName(embedderName);

test(() => {
  assert_throws_dom('SyntaxError', () => {
    window.customElements.define(
        embedderName, class extends HTMLElement {});
  });
}, 'customElements.define embedder element name');

test(() => {
  assert_throws_dom('NotSupportedError', () => {
    window.customElements.define(
        'valid-name', class extends HTMLElement {}, {extends: embedderName});
  });
}, 'customElements.define extending embedder element name');

promise_test((t) => {
  var whenDefinedPromise = window.customElements.whenDefined(embedderName);

  // With the correct behaviour, |whenDefinedPromise| will reject immediately
  // and so the following will reject.
  // With the incorrect behaviour, |whenDefinedPromise| will be forever
  // pending. Rather than waiting for the test harness to time out, we'll
  // have this resolve once we know that |whenDefinedPromise| hasn't rejected.
  var rejectImmediatelyOrResolve =
      Promise.race([whenDefinedPromise, Promise.resolve()]);

  return promise_rejects_dom(t, 'SyntaxError', rejectImmediatelyOrResolve);
}, 'customElements.whenDefined embedder element name');

</script>
chromium/third_party/blink/web_tests/custom-elements/embedder-custom-elements-not-exposed.html
