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Test Info:

<script>
document.addEventListener("DOMContentLoaded", () => {
const fieldset = document.querySelector("fieldset");
document.documentElement.contentEditable = true;
fieldset.contentEditable = false;
document.execCommand("justifyLeft");
document.designMode = "on";
document.execCommand("indent");
document.execCommand("forwardDelete");
document.execCommand("delete");
});
</script>
<acronym readonly autofocus>
<sup>
<fieldset>
here is fieldset
</fieldset>
</acronym>
</html>