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<!doctype html>
<style>textarea { resize: none; font-family: system-ui; font-size: 13px; }</style>
<textarea></textarea>
<script>
let textarea = SpecialPowers.wrap(document.querySelector("textarea"));
SpecialPowers.Cc["@mozilla.org/satchel/form-fill-controller;1"].getService(SpecialPowers.Ci.nsIFormFillController).markAsAutoCompletableField(textarea);
textarea.getBoundingClientRect();
textarea.autofillState = "preview";
</script>