Function Sizzle

2.0.3/2.0.3.js:1053–1160

( selector, context, results, seed )

        }

        function Sizzle( selector, context, results, seed ) {
            var match, elem, m, nodeType,
            // QSA vars
                i, groups, old, nid, newContext, newSelector;

            if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
                setDocument( context );
            }

            context = context || document;
            results = results || [];

            if ( !selector || typeof selector !== "string" ) {
                return results;
            }

            if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
                return [];
            }

            if ( documentIsHTML && !seed ) {

                // Shortcuts
                if ( (match = rquickExpr.exec( selector )) ) {
                    // Speed-up: Sizzle("#ID")
                    if ( (m = match[1]) ) {
                        if ( nodeType === 9 ) {
                            elem = context.getElementById( m );
                            // Check parentNode to catch when Blackberry 4.6 returns
                            // nodes that are no longer in the document #6963
                            if ( elem && elem.parentNode ) {
                                // Handle the case where IE, Opera, and Webkit return items
                                // by name instead of ID
                                if ( elem.id === m ) {
                                    results.push( elem );
                                    return results;
                                }
                            } else {
                                return results;
                            }
                        } else {
                            // Context is not a document
                            if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
                                contains( context, elem ) && elem.id === m ) {
                                results.push( elem );
                                return results;
                            }
                        }

                        // Speed-up: Sizzle("TAG")
                    } else if ( match[2] ) {
                        push.apply( results, context.getElementsByTagName( selector ) );
                        return results;

                        // Speed-up: Sizzle(".CLASS")
                    } else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
                        push.apply( results, context.getElementsByClassName( m ) );
                        return results;