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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-select-element/show-picker-disabled.html 

<!DOCTYPE html>
<title>Test showPicker() disabled requirement</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<select id="select" disabled>
    <option>Item 1</option>
</select>
<script>
    test(() => {
        assert_throws_dom('InvalidStateError', () => { select.showPicker(); });
    }, 'select showPicker() throws when disabled');
</script>