charAt -> string indexing. Close gh-1359.

src/core/init.js

@@ -23,7 +23,7 @@ var rootjQuery,
 
 		// Handle HTML strings
 		if ( typeof selector === "string" ) {
-			if ( selector.charAt(0) === "<" && selector.charAt( selector.length - 1 ) === ">" && selector.length >= 3 ) {
+			if ( selector[0] === "<" && selector[ selector.length - 1 ] === ">" && selector.length >= 3 ) {
 				// Assume that strings that start and end with <> are HTML and skip the regex check
 				match = [ null, selector, null ];
 

src/css.js

@@ -46,7 +46,7 @@ function vendorPropName( style, name ) {
 	}
 
 	// check for vendor prefixed names
-	var capName = name.charAt(0).toUpperCase() + name.slice(1),
+	var capName = name[0].toUpperCase() + name.slice(1),
 		origName = name,
 		i = cssPrefixes.length;