function d3_selection(groups) {

d3_arraySubclass(groups, d3_selectionPrototype);

return groups;

}

var d3_select = function(s, n) { return n.querySelector(s); },

d3_selectAll = function(s, n) { return n.querySelectorAll(s); },

d3_selectRoot = document.documentElement,

d3_selectMatcher = d3_selectRoot.matchesSelector || d3_selectRoot.webkitMatchesSelector || d3_selectRoot.mozMatchesSelector || d3_selectRoot.msMatchesSelector || d3_selectRoot.oMatchesSelector,

d3_selectMatches = function(n, s) { return d3_selectMatcher.call(n, s); };

// Prefer Sizzle, if available.

if (typeof Sizzle === "function") {

d3_select = function(s, n) { return Sizzle(s, n)[0]; };

d3_selectAll = function(s, n) { return Sizzle.uniqueSort(Sizzle(s, n)); };

d3_selectMatches = Sizzle.matchesSelector;

}

var d3_selectionPrototype = [];

d3.selection = function() {

return d3_selectionRoot;

};

d3.selection.prototype = d3_selectionPrototype;