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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>
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