File: button-setcustomvalidity.html

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

<button id='button_test'></button>

<script>

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

</script>