- return elem.documentElement && !elem.body ||
- elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
+ return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
+ !!elem.ownerDocument && isXML( elem.ownerDocument );
+};
+
+var posProcess = function(selector, context){
+ var tmpSet = [], later = "", match,
+ root = context.nodeType ? [context] : context;
+
+ // Position selectors must be done after the filter
+ // And so must :not(positional) so we move all PSEUDOs to the end
+ while ( (match = Expr.match.PSEUDO.exec( selector )) ) {
+ later += match[0];
+ selector = selector.replace( Expr.match.PSEUDO, "" );
+ }
+
+ selector = Expr.relative[selector] ? selector + "*" : selector;
+
+ for ( var i = 0, l = root.length; i < l; i++ ) {
+ Sizzle( selector, root[i], tmpSet );
+ }
+
+ return Sizzle.filter( later, tmpSet );