How to expand all submenus?

Question

css

How to make all submenus and child elements open at once when hovering over the main menu item? Maybe it's not quite clear described .... here's an example: prosuperfamily.ru when you hover over the menu item Man - first one submenu pops up, then when you hover over this submenu - a child element leaves. But how to arrange that when you click on the menu item Man, all submenus with children are opened at once?

Answer 1

nav .sub-item{display:none;}

<nav>
<div class="item">НОВОСТЬ<div class="sub-item">ВЛОЖЕННАЯ НОВОСТЬ</div></div>
</nav>

pure principle.

Answer 2

.FirstLevel class:hover ul {display:block;}