diff --git a/prototypes/idb-promises.html b/prototypes/idb-promises.html
new file mode 100644
index 00000000..a4d6f2f4
--- /dev/null
+++ b/prototypes/idb-promises.html
@@ -0,0 +1,181 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body>
+    <!-- <script type="text/javascript" src="promifill.js"></script> -->
+    <script type="text/javascript">
+        const PENDING = 1;
+        const RESOLVED = 2;
+        const REJECTED = 3;
+
+        function noop() {};
+
+        function SyncPromise(fn) {
+            this._listeners = [];
+            this._value = null;
+            this._state = PENDING;
+            fn(this._resolve.bind(this), this._reject.bind(this));
+        }
+
+        SyncPromise.prototype = {
+            then: function(onResolved, onRejected) {
+                if (this._state === PENDING) {
+                    this._listeners.push({onRejected: onRejected, onResolved: onResolved});
+                } else if (this._state === RESOLVED) {
+                    onResolved(this._value);
+                } else if (this._state === REJECTED) {
+                    onRejected(this._value);
+                }
+                return this;
+            },
+            catch: function(onRejected) {
+                return this.then(noop, onRejected);
+            },
+            finally: function(onResolved) {
+                return this.then(onResolved, noop);
+            },
+            _chain: function(value) {
+                if (value && typeof value.then === "function") {
+                    value.then(function(value) {
+                        self._resolve(value);
+                    }, function(err) {
+                        self._reject(err);
+                    });
+                    return true;
+                } else {
+                    return false;
+                }
+            },
+            _resolve: function(value) {
+                 if (!this._chain(value)) {
+                    this._state = RESOLVED;
+                    this._value = value;
+                    for (var i = 0; i < this._listeners.length; i += 1) {
+                        this._listeners[i].onResolved(value);
+                    }
+                }
+            },
+            _reject: function(err) {
+                this._state = REJECTED;
+                this._value = err;
+                for (var i = 0; i < this._listeners.length; i += 1) {
+                    this._listeners[i].onRejected(err);
+                }
+            }
+        }
+
+        SyncPromise.resolve = function(value) {
+            return new SyncPromise(function(resolve) {
+                resolve(value);
+            });
+        }
+
+        SyncPromise.reject = function(value) {
+            return new SyncPromise(function(_, reject) {
+                reject(value);
+            });
+        }
+        window.Promise = SyncPromise;
+    </script>
+    <!-- <script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script> -->
+    <script type="text/javascript">
+        function reqAsPromise(req) {
+            return new Promise(function (resolve, reject) {
+                req.onsuccess = function() {resolve(req);};
+                req.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
+            });
+        }
+
+        function Storage(databaseName) {
+            this._databaseName = databaseName;
+            this._database = null;
+        }
+
+        Storage.prototype = {
+            open: function() {
+                const req = window.indexedDB.open(this._databaseName);
+                const self = this;
+                req.onupgradeneeded = function(ev) {
+                    const db = ev.target.result;
+                    const oldVersion = ev.oldVersion;
+                    self._createStores(db, oldVersion);
+                }; 
+                return reqAsPromise(req).then(function() {
+                    self._database = req.result;
+                });
+            },
+            openTxn: function(mode, storeName) {
+                const tx = this._database.transaction([storeName], mode);
+                const store = tx.objectStore(storeName);
+                return Promise.resolve(store);
+            },
+            _createStores: function(db) {
+                db.createObjectStore("foos", {keyPath: ["id"]});
+            }
+        };
+
+        function getAll(store) {
+            const request = store.openCursor();
+            const results = [];
+            return new Promise(function(resolve, reject) {
+                request.onsuccess = function(event) {
+                    const cursor = event.target.result;
+                    if(cursor) {
+                        results.push(cursor.value);
+                        cursor.continue();
+                    } else {
+                        resolve(results);
+                    }
+                };
+                request.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
+            });
+        }
+
+        function main() {
+            let storage = new Storage("idb-promises");
+            let store;
+            storage.open().then(function() {
+                return storage.openTxn("readwrite", "foos");
+            }).then(function(s) {
+                store = s;
+                store.clear();
+                store.add({id: 5, name: "foo"});
+                store.add({id: 6, name: "bar"});
+                return getAll(store);
+            }).then(function(all) {
+                console.log("all1", all);
+                store.add({id: 7, name: "bazzz"});
+                return getAll(store);
+            }).then(function(all) {
+                console.log("all2", all);
+            }).catch(function(err) {
+                console.error(err.message + ": " + err.stack);
+            });
+        }
+        main();
+
+
+        /*
+        
+        we basically want something like this for IE11/Win7:
+            
+            return new Promise(function (resolve, reject) {
+                req.onsuccess = function() {
+                    resolve(req);
+                    Promise?.flushQueue();
+                };
+                req.onerror = function(e) {
+                    reject(new Error("IDB request failed: " + e.target.error.message));
+                    Promise?.flushQueue();
+                };
+            });
+
+        we don't have this problem on platforms with a native promise implementation, so we can just have our own (forked) promise polyfill? 
+         */
+    </script>
+</body>
+</html>
+ 
diff --git a/prototypes/promifill.js b/prototypes/promifill.js
new file mode 100644
index 00000000..ea256b54
--- /dev/null
+++ b/prototypes/promifill.js
@@ -0,0 +1,433 @@
+"use strict";
+
+function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+var PENDING = void 0,
+    FULFILLED = true,
+    REJECTED = false;
+
+var Promifill = /*#__PURE__*/function () {
+  _createClass(Promifill, [{
+    key: "state",
+    get: function get() {
+      return PENDING;
+    }
+  }, {
+    key: "value",
+    get: function get() {
+      return void 0;
+    }
+  }, {
+    key: "settled",
+    get: function get() {
+      return false;
+    }
+  }]);
+
+  function Promifill(executor) {
+    var _this = this;
+
+    _classCallCheck(this, Promifill);
+
+    if (typeof executor != "function") {
+      throw new TypeError("Promise resolver ".concat(Object.prototype.toString.call(executor), " is not a function"));
+    }
+
+    defineProperty(this, "chain", []);
+    defineProperty(this, "observers", []);
+    var secret = [];
+
+    var resolve = function resolve(value, bypassKey) {
+      if (_this.settled && bypassKey !== secret) {
+        return;
+      }
+
+      defineProperty(_this, "settled", true);
+      var then_ = value && value.then;
+      var thenable = typeof then_ == "function";
+
+      if (thenable) {
+        defineProperty(value, "preventThrow", true);
+      }
+
+      if (thenable && value.state === PENDING) {
+        then_.call(value, function (v) {
+          return resolve(v, secret);
+        }, function (r) {
+          return reject(r, secret);
+        });
+      } else {
+        defineProperty(_this, "value", thenable ? value.value : value);
+        defineProperty(_this, "state", thenable ? value.state : FULFILLED);
+        schedule(_this.observers.map(function (observer) {
+          return {
+            handler: _this.state === FULFILLED ? observer.onfulfill : observer.onreject,
+            value: _this.value
+          };
+        }));
+
+        if (_this.state === REJECTED) {
+          raiseUnhandledPromiseRejectionException(_this.value, _this);
+        }
+      }
+    };
+
+    var reject = function reject(reason, bypassKey) {
+      if (_this.settled && bypassKey !== secret) {
+        return;
+      }
+
+      defineProperty(_this, "settled", true);
+      defineProperty(_this, "value", reason);
+      defineProperty(_this, "state", REJECTED);
+      schedule(_this.observers.map(function (observer) {
+        return {
+          handler: observer.onreject,
+          value: _this.value
+        };
+      }));
+      raiseUnhandledPromiseRejectionException(_this.value, _this);
+    };
+
+    try {
+      executor(resolve, reject);
+    } catch (error) {
+      reject(error);
+    }
+  }
+
+  _createClass(Promifill, [{
+    key: "then",
+    value: function then(onfulfill, onreject) {
+      var _this2 = this;
+
+      var chainedPromise = new this.constructor(function (resolve, reject) {
+        var internalOnfulfill = function internalOnfulfill(value) {
+          try {
+            resolve(typeof onfulfill == "function" ? onfulfill(value) : value);
+          } catch (error) {
+            reject(error);
+          }
+        };
+
+        var internalOnreject = function internalOnreject(reason) {
+          try {
+            if (typeof onreject == "function") {
+              resolve(onreject(reason));
+            } else {
+              reject(reason);
+            }
+          } catch (error) {
+            reject(error);
+          }
+        };
+
+        if (_this2.state === PENDING) {
+          _this2.observers.push({
+            onfulfill: internalOnfulfill,
+            onreject: internalOnreject
+          });
+        } else {
+          schedule([{
+            handler: _this2.state === FULFILLED ? internalOnfulfill : internalOnreject,
+            value: _this2.value
+          }]);
+        }
+      });
+      this.chain.push(chainedPromise);
+      return chainedPromise;
+    }
+  }, {
+    key: "catch",
+    value: function _catch(onreject) {
+      return this.then(null, onreject);
+    }
+  }, {
+    key: "finally",
+    value: function _finally(oncomplete) {
+      var _this3 = this;
+
+      var chainedPromise = new this.constructor(function (resolve, reject) {
+        var internalOncomplete = function internalOncomplete() {
+          try {
+            oncomplete();
+
+            if (_this3.state === FULFILLED) {
+              resolve(_this3.value);
+            } else {
+              reject(_this3.value);
+            }
+          } catch (error) {
+            reject(error);
+          }
+        };
+
+        if (_this3.state === PENDING) {
+          _this3.observers.push({
+            onfulfill: internalOncomplete,
+            onreject: internalOncomplete
+          });
+        } else {
+          schedule([{
+            handler: internalOncomplete
+          }]);
+        }
+      });
+      this.chain.push(chainedPromise);
+      return chainedPromise;
+    }
+  }], [{
+    key: "resolve",
+    value: function resolve(value) {
+      return value && value.constructor === Promifill ? value : new Promifill(function (resolve) {
+        resolve(value);
+      });
+    }
+  }, {
+    key: "reject",
+    value: function reject(reason) {
+      return new Promifill(function (_, reject) {
+        reject(reason);
+      });
+    }
+  }, {
+    key: "all",
+    value: function all(iterable) {
+      return new Promifill(function (resolve, reject) {
+        validateIterable(iterable);
+        var iterableSize = 0;
+        var values = [];
+
+        if (isEmptyIterable(iterable)) {
+          return resolve(values);
+        }
+
+        var add = function add(value, index) {
+          values[index] = value;
+
+          if (values.filter(function () {
+            return true;
+          }).length === iterableSize) {
+            resolve(values);
+          }
+        };
+
+        var _iterator = _createForOfIteratorHelper(iterable),
+            _step;
+
+        try {
+          for (_iterator.s(); !(_step = _iterator.n()).done;) {
+            var item = _step.value;
+
+            (function (entry, index) {
+              Promifill.resolve(entry).then(function (value) {
+                return add(value, index);
+              }, reject);
+            })(item, iterableSize++);
+          }
+        } catch (err) {
+          _iterator.e(err);
+        } finally {
+          _iterator.f();
+        }
+      });
+    }
+  }, {
+    key: "race",
+    value: function race(iterable) {
+      return new Promifill(function (resolve, reject) {
+        validateIterable(iterable);
+
+        if (isEmptyIterable(iterable)) {
+          return;
+        }
+
+        var _iterator2 = _createForOfIteratorHelper(iterable),
+            _step2;
+
+        try {
+          for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
+            var entry = _step2.value;
+            Promifill.resolve(entry).then(resolve, reject);
+          }
+        } catch (err) {
+          _iterator2.e(err);
+        } finally {
+          _iterator2.f();
+        }
+      });
+    }
+  }]);
+
+  return Promifill;
+}();
+
+var defineProperty = function defineProperty(obj, propName, propValue) {
+  Object.defineProperty(obj, propName, {
+    value: propValue
+  });
+};
+
+var defer = function defer(handler) {
+  return function () {
+    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+      args[_key] = arguments[_key];
+    }
+
+    setTimeout.apply(void 0, [handler, 0].concat(args));
+  };
+};
+
+var thrower = function thrower(error) {
+  throw error instanceof Error ? error : new Error(error);
+};
+
+var raiseUnhandledPromiseRejectionException = defer(function (error, promise) {
+  if (promise.preventThrow || promise.chain.length > 0) {
+    return;
+  }
+
+  thrower(error);
+});
+
+var MutationObserverStrategy = /*#__PURE__*/function () {
+  function MutationObserverStrategy(handler) {
+    _classCallCheck(this, MutationObserverStrategy);
+
+    var observer = new MutationObserver(handler);
+    var node = this.node = document.createTextNode("");
+    observer.observe(node, {
+      characterData: true
+    });
+  }
+
+  _createClass(MutationObserverStrategy, [{
+    key: "trigger",
+    value: function trigger() {
+      this.node.data = this.node.data === 1 ? 0 : 1;
+    }
+  }]);
+
+  return MutationObserverStrategy;
+}();
+
+var NextTickStrategy = /*#__PURE__*/function () {
+  function NextTickStrategy(handler) {
+    _classCallCheck(this, NextTickStrategy);
+
+    this.scheduleNextTick = function () {
+      return process.nextTick(handler);
+    };
+  }
+
+  _createClass(NextTickStrategy, [{
+    key: "trigger",
+    value: function trigger() {
+      this.scheduleNextTick();
+    }
+  }]);
+
+  return NextTickStrategy;
+}();
+
+var BetterThanNothingStrategy = /*#__PURE__*/function () {
+  function BetterThanNothingStrategy(handler) {
+    _classCallCheck(this, BetterThanNothingStrategy);
+
+    this.scheduleAsap = function () {
+      return setTimeout(handler, 0);
+    };
+  }
+
+  _createClass(BetterThanNothingStrategy, [{
+    key: "trigger",
+    value: function trigger() {
+      this.scheduleAsap();
+    }
+  }]);
+
+  return BetterThanNothingStrategy;
+}();
+
+var getStrategy = function getStrategy() {
+  if (typeof window != "undefined" && typeof window.MutationObserver == "function") {
+    return MutationObserverStrategy;
+  }
+
+  if (typeof global != "undefined" && typeof process != "undefined" && typeof process.nextTick == "function") {
+    return NextTickStrategy;
+  }
+
+  return BetterThanNothingStrategy;
+};
+
+var schedule = function () {
+  var microtasks = [];
+
+  var run = function run() {
+    var handler, value;
+
+    while (microtasks.length > 0 && (_microtasks$shift = microtasks.shift(), handler = _microtasks$shift.handler, value = _microtasks$shift.value, _microtasks$shift)) {
+      var _microtasks$shift;
+
+      handler(value);
+    }
+  };
+
+  var Strategy = getStrategy();
+  var ctrl = new Strategy(run);
+  return function (observers) {
+    if (observers.length == 0) {
+      return;
+    }
+
+    microtasks = microtasks.concat(observers);
+    observers.length = 0;
+    ctrl.trigger();
+  };
+}();
+
+var isIterable = function isIterable(subject) {
+  return subject != null && typeof subject[Symbol.iterator] == "function";
+};
+
+var validateIterable = function validateIterable(subject) {
+  if (isIterable(subject)) {
+    return;
+  }
+
+  throw new TypeError("Cannot read property 'Symbol(Symbol.iterator)' of ".concat(Object.prototype.toString.call(subject), "."));
+};
+
+var isEmptyIterable = function isEmptyIterable(subject) {
+  var _iterator3 = _createForOfIteratorHelper(subject),
+      _step3;
+
+  try {
+    for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
+      var _ = _step3.value;
+      // eslint-disable-line no-unused-vars
+      return false;
+    }
+  } catch (err) {
+    _iterator3.e(err);
+  } finally {
+    _iterator3.f();
+  }
+
+  return true;
+};
+
+//if (!window.Promise) {
+    window.Promise = Promifill;
+//}