浏览器的引擎，及兼容性

浏览器	Rendering Engine	CSS Extensions	Common CSS	Javascript Engine	Comments for JS Engine
Chrome	WebKit	-webkit-		V8 Engine	No intermediate parser and it generates an assembler using its own runtime environment. This has allowed Chrome to become one of the fastest browsers.
Safari	WebKit	-webkit-		Nitro
Firefox	Gecko	-moz-		Jägermonkey
IE	Trident	-ms-	* or _       Such as  *color:red or _color:red 只有IE能识别，而且会覆盖之前的定义。	Chakra
Opera	Presto	-o-		Carakan