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diff --git a/testing/web-platform/tests/IndexedDB/idbindex-rename.html b/testing/web-platform/tests/IndexedDB/idbindex-rename.html
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+++ b/testing/web-platform/tests/IndexedDB/idbindex-rename.html
@@ -0,0 +1,299 @@
+<!DOCTYPE html>
+<meta name="timeout" content="long">
+<title>IndexedDB: index renaming support</title>
+<link rel="help"
+      href="https://w3c.github.io/IndexedDB/#dom-idbindex-name">
+<link rel="author" href="pwnall@chromium.org" title="Victor Costan">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support-promises.js"></script>
+<script>
+
+promise_test(testCase => {
+    let authorIndex = null, authorIndex2 = null;
+    let renamedAuthorIndex = null, renamedAuthorIndex2 = null;
+    return createDatabase(testCase, (database, transaction) => {
+        const store = createBooksStore(testCase, database);
+        authorIndex = store.index('by_author');
+    }).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, ['by_author', 'by_title'],
+            'Test setup should have created two indexes');
+        authorIndex2 = store.index('by_author');
+        return checkAuthorIndexContents(
+            testCase, authorIndex2,
+            'The index should have the expected contents before any renaming').
+            then(() => database.close());
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        renamedAuthorIndex = store.index('by_author');
+        renamedAuthorIndex.name = 'renamed_by_author';
+
+        assert_equals(
+            renamedAuthorIndex.name, 'renamed_by_author',
+            'IDBIndex name should change immediately after a rename');
+        assert_array_equals(
+            store.indexNames, ['by_title', 'renamed_by_author'],
+            'IDBObjectStore.indexNames should immediately reflect the rename');
+        assert_equals(
+            store.index('renamed_by_author'), renamedAuthorIndex,
+            'IDBObjectStore.index should return the renamed index store when ' +
+            'queried using the new name immediately after the rename');
+        assert_throws(
+            'NotFoundError', () => store.index('by_author'),
+            'IDBObjectStore.index should throw when queried using the ' +
+            "renamed index's old name immediately after the rename");
+    })).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, ['by_title', 'renamed_by_author'],
+            'IDBObjectStore.indexNames should still reflect the rename after ' +
+            'the versionchange transaction commits');
+        renamedAuthorIndex2 = store.index('renamed_by_author');
+        return checkAuthorIndexContents(
+            testCase, renamedAuthorIndex2,
+            'Renaming an index should not change its contents').then(
+            () => database.close());
+    }).then(() => {
+        assert_equals(
+            authorIndex.name, 'by_author',
+            'IDBIndex obtained before the rename transaction should not ' +
+            'reflect the rename');
+        assert_equals(
+            authorIndex2.name, 'by_author',
+            'IDBIndex obtained before the rename transaction should not ' +
+            'reflect the rename');
+        assert_equals(
+            renamedAuthorIndex.name, 'renamed_by_author',
+            'IDBIndex used in the rename transaction should keep reflecting ' +
+            'the new name after the transaction is committed');
+        assert_equals(
+            renamedAuthorIndex2.name, 'renamed_by_author',
+            'IDBIndex obtained after the rename transaction should reflect ' +
+            'the new name');
+    });
+}, 'IndexedDB index rename in new transaction');
+
+promise_test(testCase => {
+    let renamedAuthorIndex = null, renamedAuthorIndex2 = null;
+    return createDatabase(testCase, (database, transaction) => {
+        const store = createBooksStore(testCase, database);
+        renamedAuthorIndex = store.index('by_author');
+        renamedAuthorIndex.name = 'renamed_by_author';
+
+        assert_equals(
+            renamedAuthorIndex.name, 'renamed_by_author',
+            'IDBIndex name should change immediately after a rename');
+        assert_array_equals(
+            store.indexNames, ['by_title', 'renamed_by_author'],
+            'IDBObjectStore.indexNames should immediately reflect the rename');
+        assert_equals(
+            store.index('renamed_by_author'), renamedAuthorIndex,
+            'IDBObjectStore.index should return the renamed index store when ' +
+            'queried using the new name immediately after the rename');
+        assert_throws(
+            'NotFoundError', () => store.index('by_author'),
+            'IDBObjectStore.index should throw when queried using the ' +
+            "renamed index's old name immediately after the rename");
+    }).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, ['by_title', 'renamed_by_author'],
+            'IDBObjectStore.indexNames should still reflect the rename after ' +
+            'the versionchange transaction commits');
+        renamedAuthorIndex2 = store.index('renamed_by_author');
+        return checkAuthorIndexContents(
+            testCase, renamedAuthorIndex2,
+            'Renaming an index should not change its contents').then(
+            () => database.close());
+    }).then(() => {
+        assert_equals(
+            renamedAuthorIndex.name, 'renamed_by_author',
+            'IDBIndex used in the rename transaction should keep reflecting ' +
+            'the new name after the transaction is committed');
+        assert_equals(
+            renamedAuthorIndex2.name, 'renamed_by_author',
+            'IDBIndex obtained after the rename transaction should reflect ' +
+            'the new name');
+    });
+}, 'IndexedDB index rename in the transaction where it is created');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        const index = store.index('by_author');
+        index.name = 'by_author';
+        assert_array_equals(
+            store.indexNames, ['by_author', 'by_title'],
+            'Renaming an index to the same name should not change the ' +
+            "index's IDBObjectStore.indexNames");
+    })).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, ['by_author', 'by_title'],
+            'Committing a transaction that renames a store to the same name ' +
+            "should not change the index's IDBObjectStore.indexNames");
+        const index = store.index('by_author');
+        return checkAuthorIndexContents(
+            testCase, index,
+            'Committing a transaction that renames an index to the same name ' +
+            "should not change the index's contents").then(
+            () => database.close());
+    });
+}, 'IndexedDB index rename to the same name succeeds');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        const index = store.index('by_author');
+        store.deleteIndex('by_title');
+        index.name = 'by_title';
+        assert_array_equals(
+            store.indexNames, ['by_title'],
+            'IDBObjectStore.indexNames should immediately reflect the rename');
+    })).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, ['by_title'],
+            'IDBObjectStore.indexNames should still reflect the rename after ' +
+            'the versionchange transaction commits');
+        const index = store.index('by_title');
+        return checkAuthorIndexContents(
+            testCase, index,
+            'Renaming an index should not change its contents').then(
+            () => database.close());
+    });
+}, 'IndexedDB index rename to the name of a deleted index succeeds');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        store.index('by_author').name = 'tmp';
+        store.index('by_title').name = 'by_author';
+        store.index('tmp').name = 'by_title';
+        assert_array_equals(
+            store.indexNames, ['by_author', 'by_title'],
+            'IDBObjectStore.indexNames should reflect the swap immediately ' +
+            'after the renames');
+        return checkTitleIndexContents(
+            testCase, store.index('by_author'),
+            'Renaming an index should not change its contents');
+    })).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, ['by_author', 'by_title'],
+            'IDBObjectStore.indexNames should still reflect the swap after ' +
+            'the versionchange transaction commits');
+        const index = store.index('by_title');
+        return checkAuthorIndexContents(
+            testCase, index,
+            'Renaming an index should not change its contents').then(
+            () => database.close());
+    });
+}, 'IndexedDB index swapping via renames succeeds');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        const index = store.index('by_author');
+
+        index.name = 42;
+        assert_equals(index.name, '42',
+            'IDBIndex name should change immediately after a rename to a ' +
+            'number');
+        assert_array_equals(
+            store.indexNames, ['42', 'by_title'],
+            'IDBObjectStore.indexNames should immediately reflect the ' +
+            'stringifying rename');
+
+        index.name = true;
+        assert_equals(index.name, 'true',
+            'IDBIndex name should change immediately after a rename to a ' +
+            'boolean');
+
+        index.name = {};
+        assert_equals(index.name, '[object Object]',
+            'IDBIndex name should change immediately after a rename to an ' +
+            'object');
+
+        index.name = () => null;
+        assert_equals(index.name, '() => null',
+            'IDBIndex name should change immediately after a rename to a ' +
+            'function');
+
+        index.name = undefined;
+        assert_equals(index.name, 'undefined',
+            'IDBIndex name should change immediately after a rename to ' +
+            'undefined');
+    })).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, ['by_title', 'undefined'],
+            'IDBObjectStore.indexNames should reflect the last rename ' +
+            'after the versionchange transaction commits');
+        const index = store.index('undefined');
+        return checkAuthorIndexContents(
+            testCase, index,
+            'Renaming an index should not change its contents').then(
+            () => database.close());
+    });
+}, 'IndexedDB index rename stringifies non-string names');
+
+for (let escapedName of ['', '\\u0000', '\\uDC00\\uD800']) ((escapedName) => {
+  const name = JSON.parse('"' + escapedName + '"');
+  promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        const index = store.index('by_author');
+
+        index.name = name;
+        assert_equals(index.name, name,
+            'IDBIndex name should change immediately after the rename');
+        assert_array_equals(
+            store.indexNames, [name, 'by_title'].sort(),
+            'IDBObjectStore.indexNames should immediately reflect the rename');
+    })).then(database => {
+        const transaction = database.transaction('books', 'readonly');
+        const store = transaction.objectStore('books');
+        assert_array_equals(
+            store.indexNames, [name, 'by_title'].sort(),
+            'IDBObjectStore.indexNames should reflect the rename ' +
+            'after the versionchange transaction commits');
+        const index = store.index(name);
+        return checkAuthorIndexContents(
+            testCase, index,
+            'Renaming an index should not change its contents').then(
+            () => database.close());
+    });
+  }, 'IndexedDB index can be renamed to "' + escapedName + '"');
+})(escapedName);
+
+</script>