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Test Info:

<!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>