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

<input id='input_test'>

<script>

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

</script>