ids_and_classes.js

(function () {

  var
    global = this,

    ArrProto = global.Array.prototype,

    proto_slice = ArrProto.slice,
    proto_map = ArrProto.map,
    proto_reduce = ArrProto.reduce,

    object_keys = global.Object.keys,

    doc = global.document,

    idList = proto_map.call(
      doc.querySelectorAll("[id]"),
      function (elm) {

        return elm.id;
      }
    ).sort(),

    classNameList = object_keys(proto_reduce.call(
      doc.querySelectorAll("[class]"),
      function (collector, elm) {

        return collector.concat(proto_slice.call(elm.classList));

      }, []).reduce(function (collector, className) {

        return ((collector[className] = 1) && collector);

      }, {})
    ).sort()
  ;

  return {
    "idList"          : idList,
    "idStream"        : idList.join(", "),
    "classNameList"   : classNameList,
    "classNameStream" : classNameList.join(", ")
  };

}).call(null);

ids_and_classes.min.js

(function(){var a=this.Array.prototype,d=a.slice,b=a.reduce,e=this.Object.keys,c=this.document,a=a.map.call(c.querySelectorAll("[id]"),function(a){return a.id}).sort(),b=e(b.call(c.querySelectorAll("[class]"),function(a,b){return a.concat(d.call(b.classList))},[]).reduce(function(a,b){return(a[b]=1)&&a},{})).sort();return{idList:a,idStream:a.join(", "),classNameList:b,classNameStream:b.join(", ")}}).call(null);