## Form fields

`INPUT`, `SELECT` and `TEXTAREA` are only allowed within `FORM` elements. `INPUT` can be used for a variety of form fields including single line text fields, password fields, checkboxes, radio buttons, submit and reset buttons, hidden fields, file upload, and image buttons. `SELECT` elements are used for single or multiple choice menus. `TEXTAREA` elements are used to define multi-line text fields. The content of the element is used to initialize the field.