Why doesn't this css work on Mac?

Question

css

HTML

<nav>
   <ul>
      <li></li>
     ...
   </ul>
</nav>

css

nav:not(:focus) ul:not(:active) { /* магия кнопки "меню", благодаря чему навигация скрывается/появляется по щелчку */
    display: none;
  }

Dropdown menu written in css does not work on iPhone. What properties are not supported?

Answer 1

Should work from version 10.3