Not every form field is a text box. <select> gives users a dropdown of pre-defined options — or a multi-select list. <textarea> gives them a resizable multi-line text area for longer input. And <datalist> adds autocomplete suggestions to any text input. Together, these three elements cover almost every remaining form use case.
1-A 2-A 3-A 4-A | 5 optgroup 6 cols 7 = <select name="c"><option>PK</option><option>UK</option><option>US</option></select> 8 = <textarea rows="5" cols="40"></textarea> 9 = Few options = radios (visible); many = select (compact) | 10 = Put it between the opening and closing tags