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Test Info:
<!doctype html>
<style>select { font-family: system-ui; font-size: 13px }</style>
<select><option>A</option><option>Much longer option text</option></select>
<script>
let select = SpecialPowers.wrap(document.querySelector("select"));
select.previewValue = "Autofill";
select.autofillState = "preview";
</script>