The size of the TextArea. Additional components and props can be used to vary this layout on a per-form basis. Bootstrap Textarea Placeholder Introduction. Easily extend form controls by adding text, buttons, or button groups on either side of textual inputs, custom selects, and custom file inputs. Konrad Pilch 2,434 Points February 12, 2015 12:26am: p that worked perfectly ! Not a big fan of changing globally the textarea css attr. Whether user is allowed to resize the textarea. Auto height can also automatically adjust its height (text rows) to fit the content, even as the user enters or deletes text. Only use this when the containing context provides sufficient affordance. Form groups.