Louis

Super Browser Detector adds PHP user agent information to the body class to help target specific devices, browsers, and operating systems with CSS.
Major features in User Agent Body Class include:
<ul>
<li>Adds user browser and operating system information as a string to the body class.</li>
</ul>

Super Browser Detector

License: GPLv2 or later Super Browser Detector adds PHP user agent information to the body class

sureshdsk

This script helps to write css for the following
<h3>Browsers:</h3>
Internet Explorer 6 
Internet Explorer 7 
Internet Explorer 8 
Internet Explorer 9 
Internet Explorer 10 
Mozilla Firefox 
Safari 
Google Chrome 
Opera 
Konqueror 
Maxthon 
Rockmelt 
Flock 
<h3>Mobile Browsers:</h3>
Internet Explorer Mobile 
Opera Mini 
Opera Mobile 
Firefox Mobile 
Bolt 
<h3>Operating systems:</h3>
Windows (All windows os) 
Windows XP 
Windows Vista 
Windows 7 
Windows 8 
Mac 
iOS(iphone,ipad and ipod) 
Linux 
<h3>Devices:</h3>
iPhone 
iPad 
iPod 
Android 
Symbian 
Blackberry 
Windows phone 
<h3>More information: </h3>
<a href="http://cloudwark.in/ultimate-browser-specific-css" rel="nofollow ugc">read documentation</a> 
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Ultimate Browser Specific Css

This is a javascript plugin that helps you to write Browser specific css on your wordpress website

Super Browser Detector vs Ultimate Browser Specific Css