Quick and dirty test css3 support via javascript

gistfile1.js

var supports = (function() {
	var div		= document.createElement('div'),
		vendors	= 'Khtml Ms O Moz Webkit'.split(' '),
		len		= vendors.length;
	
	return function(prop) {
		if ( prop in div.style ) return true;
		
		prop = prop.replace(/^[a-z]/, function(val) {
			return val.toUpperCase();
		});
		
		while(len--) {
			if ( vendors[len] + prop in div.style ) {
				// browser supports box-shadow. Do what you need.
				// Or use a bang (!) to test if the browser doesn't.
				return true;
			}
		}
		return false;
	};

})();

if ( supports('textShadow') ) {
	document.documentElement.className += ' textShadow';
}