for people who use a browser's zoom feature to increase the size of content.
          </li>
          <li>
            To enhance perceivability when operating the combobox, visual keyboard focus and hover are styled using the CSS <code>:hover</code> pseudo-class, and <code>focus</code> and <code>blur</code> event handlers:
            <ul>
              <li>To make it easier to perceive when the combobox receives focus, focus creates a 2 pixel focus ring around both the <code>input</code> and <code>button