<label class="example-listbox-label" id="example-fav-color-label"> Favorite color </label> <ul cdkListbox aria-labelledby="example-fav-color-label" class="example-listbox"> <li cdkOption="red" class="example-option">Red</li> <li cdkOption="green" class="example-option">Green</li> <li cdkOption="blue" class="example-option">Blue</li> </ul>