Limit characters in Textarea in HTML

<textarea maxlength="10">

The easiest way to limit the number of characters in a textarea is to use the maxlength attribute. The maxlength attribute controls the maximum number of characters (UTF-16 code units) that the user can enter. If this value isn't specified, the user can enter an unlimited number of characters. However, this is only a client-side solution that can be easily manipulated by the user. For this reason, it is important not to forget about server-side validation.

You should also be aware that using the maxlength attribute does not give the user any visual feedback on how many more characters they can type into the field.