Optgroup element
The <optgroup> element is used to group together related <option> elements within a parent <select> drop-down list.Try this code-- <html> <body> <h1>The optgroup element</h1> <Comment>The optgroup tag is used to group related options in a drop-down list:</comment> <label for="cars">Choose a car:</label> <select name="cars" id="cars"> <optgroup label="Swedish Cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> </optgroup> <optgroup label="German Cars"> <option value="mercedes">Mercedes</option> <option value="audi">Audi</option> </optgroup> </select> <br><br> <input type="submit" value="Submit"> </form> ...