
1 - Cross browser inline block
<style>
li {
width: 200px;
min-height: 250px;
border: 1px solid #000;
display: -moz-inline-stack;
display: inline-block;
margin: 5px;
zoom: 1;
*display: inline;
_height: 250px;
}
</style>
<ul>
<li>
<div>
<h4>This is awesome</h4>
<img src="http://farm4.static.flickr.com/3623/3279671785_d1f2e665b6_s.jpg" alt="lobster" width="75" height="75"/>
</div>
</li>
<li>
<!-- etc ... -->
</li>
</ul>Source: Cross browser inline-block property 
2 - Disable Textarea resizing for Safari
/ * Supports: car, both, horizontal, none, vertical * /
textarea }
resize: none;
}3 - Cross browser rounded corners
.rounded{
-moz-border-radius: 5px; /* Firefox */
-webkit-border-radius: 5px; /* Safari */
}Source: Border-radius: create rounded corners with CSS! 
4 - Cross browser min-height property
selector {
min-height:500px;
height:auto !important;
height:500px;
}Source: Min-height fast hack 
5 - Image Rollover Borders That Do Not Change Layout
#example-one a img, #example-one a {
border: none;
overflow: hidden;
float: left;
}
#example-one a:hover {
border: 3px solid black;
}
#example-one a:hover img {
margin: -3px;
}Source: Image rollovers that do not change layout 
6 - Cross browser transparency
.transparent_class {
filter:alpha(opacity=50);
-moz-opacity:0.5;
-khtml-opacity: 0.5;
opacity: 0.5;
}Source: CSS transparency settings for all browsers 
7 - Lighbox in pure CSS: No Javascript needed!
Source: Lightbox effect in pure CSS: No javascript needed!

8 - Cross browser pure css tooltips
<style type="text/css">
a:hover {
background:#ffffff;
text-decoration:none;} /*BG color is a must for IE6*/
a.tooltip span {
display:none;
padding:2px 3px;
margin-left:8px;
width:130px;
}
a.tooltip:hover span{
display:inline;
position:absolute;
background:#ffffff;
border:1px solid #cccccc;
color:#6c6c6c;
}
</style>
Easy <a class="tooltip" href="#">Tooltip<span>This is the crazy little Easy Tooltip Text.</span></a>.Source: Easy CSS Tooltip 
9 - Set color of selected text (Firefox/Safari only)
::selection {
background: #ffb7b7; /* Safari */
}
::-moz-selection {
background: #ffb7b7; /* Firefox */
}Source: Use CSS to Override Default Text Selection Color 
10 - Add File Type Icons next to your links
a[href^="http://"] {
background:transparent url(../images/external.png) center right no-repeat;
display:inline-block;
padding-right:15px;
}Source: Add File Type Icons next to your links with CSS 










