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+<!doctype html>
+<meta charset="utf8">
+<title>IndexedDB: aborting transactions reverts an object store's key generator state</title>
+<link rel="help" href="https://w3c.github.io/IndexedDB/#abort-transaction">
+<link rel="author" href="pwnall@chromium.org" title="Victor Costan">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support-promises.js"></script>
+<script>
+'use strict';
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => {
+        return new Promise((resolve, reject) => {
+            const request = indexedDB.open(databaseName(testCase), 2);
+            request.onupgradeneeded = testCase.step_func(event => {
+                const database = event.target.result;
+                const transaction = event.target.transaction;
+                const store = transaction.objectStore('books');
+                const request2 = store.put(
+                    { title: 'Bedrock Nights II', author: 'Barney' });
+                request2.onerror = testCase.unreached_func(
+                    'IDBObjectStore.put() should not receive an error request');
+                request2.onsuccess = testCase.step_func(event => {
+                    assert_equals(
+                        event.target.result, 345679,
+                        "The key generator's current number should be set by " +
+                        'the last put operation in the database creation ' +
+                        'transaction');
+
+                    request.onerror = event => {
+                        event.preventDefault();
+                        resolve(event);
+                    };
+                    request.onsuccess = () => reject(new Error(
+                        'indexedDB.open should not succeed after the ' +
+                        'versionchange transaction is aborted'));
+
+                    transaction.abort();
+                });
+            });
+            request.onerror = event => reject(event.target.error);
+            request.onsuccess = () => reject(new Error(
+                'indexedDB.open should not succeed without creating a ' +
+                'versionchange transaction'));
+        });
+    }).then(() => {
+        return openDatabase(testCase, 1);
+    }).then(database => {
+        const transaction = database.transaction(['books'], 'readwrite');
+        const store = transaction.objectStore('books');
+
+        return checkStoreGenerator(
+            testCase, store, 345679,
+            "The key generator's current number should be reverted after the " +
+            'transaction modifying it is aborted').then(() => database.close());
+    });
+}, 'The current number of a key generator is reverted when a versionchange ' +
+    'transaction aborts');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        return new Promise((resolve, reject) => {
+            const transaction = database.transaction(['books'], 'readwrite');
+            const store = transaction.objectStore('books');
+            const request = store.put(
+                { title: 'Bedrock Nights II', author: 'Barney' });
+            request.onerror = testCase.unreached_func(
+                'IDBObjectStore.put() should not receive an error request');
+            request.onsuccess = testCase.step_func(event => {
+                assert_equals(
+                    event.target.result, 345679,
+                    "The key generator's current number should be set by the " +
+                    'last put operation in the database creation transaction');
+
+                transaction.onabort = event => {
+                    event.preventDefault();
+                    resolve(event);
+                }
+                transaction.abort();
+            });
+            transaction.onabort = () => reject(new Error(
+                'The aborted readwrite transaction should not receive an ' +
+                'abort event before IDBTransaction.abort() is called'));
+            transaction.oncomplete = () => reject(new Error(
+                'The aborted readwrite transaction should not receive a ' +
+                'completed event'));
+            transaction.onerror = () => reject(new Error(
+                'The aborted readwrite transaction should not receive an ' +
+                'error event'));
+        }).then(() => database);
+    }).then(database => {
+        const transaction = database.transaction(['books'], 'readwrite');
+        const store = transaction.objectStore('books');
+
+        return checkStoreGenerator(
+            testCase, store, 345679,
+            "The key generator's current number should be reverted after the " +
+            'transaction modifying it is aborted').then(() => database.close());
+    });
+}, 'The current number of a key generator is reverted when a readwrite ' +
+    'transaction aborts');
+
+</script>