Subtree menu on hover

HTML:

<div class=”menu”>

 <div>Menu</div>

<div class=”popup”>

<a href=”#”>Submenu1</a>

</div>

</div>

 

CSS:

div.menu div.popup{

display:none;

}

div.menu:hover div.popup{

display:block;

}

 

http://ianlunn.github.io/Hover/ -> a collection of CSS3 powered hover effects.