Hide Specific ul li elements
HTML:
<ul class="links">
<li>some link1</li>
<li>some link2</li>
<li>some link3</li>
<li>some link4</li>
</ul>
/* this will hide the second , fourth and fifth li element */
ul.links li:nth-child(2), ul.links li:nth-child(4), ul.links li:nth-child(5) {
display: none;
}