Element.prototype.matches||(Element.prototype.matches=Element.prototype.matchesSelector||Element.prototype.mozMatchesSelector||Element.prototype.msMatchesSelector||Element.prototype.oMatchesSelector||Element.prototype.webkitMatchesSelector||function(a){a=(this.document||this.ownerDocument).querySelectorAll(a);for(var b=a.length;0<=--b&&a.item(b)!==this;);return-1<b});