Can I use div as a direct child of UL?

I'm having this code:

<ul>
   <div>
   </div>
</ul>

I feel no issue in my browser rendering it. I have read this too somewhere that li should only be used as direct child of ul.

Is this correct? Can't I use div as a direct child of UL? Is there any documentation for the above confusion?

Edit: This link says I can http://css-tricks.com/forums/discussion/11593/divs-inside-uls/p1