autofill-line-height.html

Enable keyboard shortcuts

<!doctype html>

<style>

  textarea { height: 4em; color: GrayText; font-family: system-ui }

</style>

<textarea style="resize: none;">Autofill</textarea>

<script>

  let textarea = SpecialPowers.wrap(document.querySelector("textarea"));

  textarea.autofillState = "autofill";

</script>