Use
An HTML text area selects an input area on a Web page, which, in contrast to input fields, can consist of several lines. The text area is like a small editor area but, however, formatting is not permitted. Using a text area, the user can enter their own text, for example, feedback about a training course or a product.
You can mark a text node as a text area using the Web attributes in the Form Builder. The text node is then converted in a
Web form to a text area, regardless of whether it is a text element, a text module, or an include text.Procedure

Note that no formatting is permitted in HTML text areas. For this reason, Smart Forms ignores formatting in the conversion to HTML.

If you text area is to be 80 characters wide and 20 characters high, enter 80 in the first input field and 20 in the second input field. The width and height of a character is "average" according to the HTML specification.
Result
Smart Forms generates a text area for the text node in the HTML output. If the text area is too big for the output window, the output is cut accordingly.