The disabled property of the HTMLTextAreaElement interface indicates whether this multi-line text control is disabled and cannot be interacted with. It reflects the <textarea> element's disabled attribute. When false, this textarea may still be disabled if its containing element, such as a <fieldset>, is disabled.
A boolean.
const textareaElement = document.getElementById("comment");
if (commentsDisabled) {
textareaElement.disabled = true;
}