- var ret = seed ?
- { expr: parts.pop(), set: makeArray(seed) } :
- Sizzle.find( parts.pop(), parts.length === 1 && context.parentNode ? context.parentNode : context, isXML(context) );
- set = Sizzle.filter( ret.expr, ret.set );
-
- if ( parts.length > 0 ) {
- checkSet = makeArray(set);
- } else {
- prune = false;
+ // Take a shortcut and set the context if the root selector is an ID
+ // (but not if it'll be faster if the inner selector is an ID)
+ if ( !seed && parts.length > 1 && context.nodeType === 9 && !contextXML &&
+ Expr.match.ID.test(parts[0]) && !Expr.match.ID.test(parts[parts.length - 1]) ) {
+ var ret = Sizzle.find( parts.shift(), context, contextXML );
+ context = ret.expr ? Sizzle.filter( ret.expr, ret.set )[0] : ret.set[0];