<!DOCTYPE html>
<script>

var openRequest = window.indexedDB.open("IndexedDBTempFileSize");
openRequest.onupgradeneeded = function(event) {
    window.webkit.messageHandlers.testHandler.postMessage('UpgradeNeeded');

    event.target.result.createObjectStore("TestObjectStore");
} 

openRequest.onsuccess = function(event) {
    window.webkit.messageHandlers.testHandler.postMessage('Success');
    var transaction = event.target.result.transaction(["TestObjectStore"], "readwrite");
    var objectStore = transaction.objectStore("TestObjectStore");
    for (let i = 0; i < 100; i++) {
        objectStore.add(i, i);
    }
}

openRequest.onerror = function(event) {
    window.webkit.messageHandlers.testHandler.postMessage('Error');
}

</script>