diff -r 000000000000 -r 6474c204b198 dom/interfaces/storage/nsIDOMStorage.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/storage/nsIDOMStorage.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "domstubs.idl"
+
+/**
+ * Interface for client side storage. See
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/structured.html#storage0
+ * for more information.
+ *
+ * A storage object stores an arbitrary set of key-value pairs, which
+ * may be retrieved, modified and removed as needed. A key may only
+ * exist once within a storage object, and only one value may be
+ * associated with a particular key. Keys are stored in a particular
+ * order with the condition that this order not change by merely changing
+ * the value associated with a key, but the order may change when a
+ * key is added or removed.
+ */
+
+[scriptable, uuid(43E5EDAD-1E02-42c4-9D99-C3D9DEE22A20)]
+interface nsIDOMStorage : nsISupports
+{
+  /**
+   * The number of keys stored.
+   */
+  readonly attribute unsigned long length;
+
+  /**
+   * Retrieve the name of the key at a particular index.
+   *
+   * @param index index of the item to retrieve
+   * @returns the key at index, null if there is no key at that index
+   */
+  DOMString key(in unsigned long index);
+
+  /**
+   * Retrieve an item with a given key
+   *
+   * @param key key to retrieve
+   * @returns found data or empty string if the key was not found
+   */
+  DOMString getItem([Null(Stringify)] in DOMString key);
+
+  /**
+   * Assign a value with a key. If the key does not exist already, a new
+   * key is added associated with that value. If the key already exists,
+   * then the existing value is replaced with a new value.
+   *
+   * @param key key to set
+   * @param data data to associate with the key
+   */
+  void setItem([Null(Stringify)] in DOMString key, [Null(Stringify)] in DOMString data);
+
+  /**
+   * Remove a key and its corresponding value.
+   *
+   * @param key key to remove
+   */
+  void removeItem([Null(Stringify)] in DOMString key);
+
+  /**
+   * Clear the content of this storage bound to a domain
+   * or an origin.
+   */
+  void clear();
+};