IndexedDB event propagation in IE 10 Platform Preview 5

gistfile1.js

var req = msIndexedDB.deleteDatabase("MyDB");
req.onsuccess = function () {
    var req = msIndexedDB.open("MyDB");
    req.onupgradeneeded = function (event) {
        var db = event.target.result;
        var store = db.createObjectStore("MyStore", {autoIncrement: true });
        store.createIndex("name", "name", { unique: true });
    };
    req.onsuccess = function (event) {
        var db = event.target.result;
        db.onerror = function () {
            console.log("db error");
        };
        db.onabort = function () {
            console.log('db abort');
        };
        var tx = db.transaction(["MyStore"], IDBTransaction.READ_WRITE);
        tx.onerror = function () {
            console.log("tx error");
        };
        tx.onabort = function () {
            console.log('tx abort');
        };
        tx.oncomplete = function () {
            console.log('tx complete');
        };
        var store = tx.objectStore("MyStore");
        var req = store.put({ name: "aaa", age: 20});
        req.onsuccess = function () {
            var req = store.put({ name: "aaa", age: 20});
            req.onsuccess = function (event) {
                console.log("success");
            };
            req.onerror = function (event) {
                //event.stopPropagation();
                console.log("store put 2 error");
            };
        };
        req.onerror = function (event) {
            console.log("store put 1 error");
        };
    };
    req.onerror = function (event) {
        console.log("msIndexedDB open error");
    };
};
req.onerror = function (event) {
    console.log("msIndexedDB deleteDatabase error");
};


// store put 2 error 
// tx error 
// db error 
// tx abort 
// db abort