chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-fieldset-element/fieldset-setcustomvalidity.html

<!DOCTYPE HTML>
<title>fieldset setCustomValidity</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<fieldset id='fieldset_test'></fieldset>

<script>

test(() => {
  let elem = document.getElementById("fieldset_test");
  assert_false(elem.validity.customError);
  elem.setCustomValidity("custom error");
  assert_true(elem.validity.customError);
}, "fieldset setCustomValidity is correct")

</script>