File: ElementInternals-NotSupportedError.html

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<!DOCTYPE html>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
  class NotFormAssociatedElement extends HTMLElement {}
  customElements.define('my-element1', NotFormAssociatedElement);
  const element = new NotFormAssociatedElement();
  const i = element.attachInternals();

  assert_throws_dom('NotSupportedError', () => i.setFormValue(''));
  assert_throws_dom('NotSupportedError', () => i.form);
  assert_throws_dom('NotSupportedError', () => i.setValidity({}));
  assert_throws_dom('NotSupportedError', () => i.willValidate);
  assert_throws_dom('NotSupportedError', () => i.validity);
  assert_throws_dom('NotSupportedError', () => i.validationMessage);
  assert_throws_dom('NotSupportedError', () => i.checkValidity());
  assert_throws_dom('NotSupportedError', () => i.reportValidity());
  assert_throws_dom('NotSupportedError', () => i.labels);
}, 'Form-related operations and attributes should throw NotSupportedErrors' +
     ' for non-form-associated custom elements.');
</script>
</body>