HTML Guide for rows

The attribute rows on a textarea element, when present, must be a positive integer.

The <textarea> HTML element represents a multi-line plain-text editing control, useful when you want to allow users to enter a sizeable amount of free-form text, for example a comment on a review or feedback form. Its attributes rows and cols allow to define the dimensions of the text area by respectively specifying the numbers of rows and columns.

Example:

<textarea name="comments" rows="5" cols="25">
  It all works great!
</textarea>