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diff --git a/dom/webidl/Directory.webidl b/dom/webidl/Directory.webidl
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+/* -*- 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/.
+ */
+
+/*
+ * All functions on Directory that accept DOMString arguments for file or
+ * directory names only allow relative path to current directory itself. The
+ * path should be a descendent path like "path/to/file.txt" and not contain a
+ * segment of ".." or ".". So the paths aren't allowed to walk up the directory
+ * tree. For example, paths like "../foo", "..", "/foo/bar" or "foo/../bar" are
+ * not allowed.
+ *
+ * http://w3c.github.io/filesystem-api/#idl-def-Directory
+ * https://microsoftedge.github.io/directory-upload/proposal.html#directory-interface
+ */
+
+// This chromeConstructor is used by the MockFilePicker for testing only.
+[ChromeConstructor(DOMString path),
+ Exposed=(Window,Worker)]
+interface Directory {
+  /*
+   * The leaf name of the directory.
+   */
+  [Throws]
+  readonly attribute DOMString name;
+};
+
+[Exposed=(Window,Worker)]
+partial interface Directory {
+  // Already defined in the main interface declaration:
+  //readonly attribute DOMString name;
+
+  /*
+   * The path of the Directory (includes both its basename and leafname).
+   * The path begins with the name of the ancestor Directory that was
+   * originally exposed to content (say via a directory picker) and traversed
+   * to obtain this Directory.  Full filesystem paths are not exposed to
+   * unprivilaged content.
+   */
+  [Throws]
+  readonly attribute DOMString path;
+
+  /*
+   * Getter for the immediate children of this directory.
+   */
+  [Throws]
+  Promise<sequence<(File or Directory)>> getFilesAndDirectories();
+
+  [Throws]
+  Promise<sequence<File>> getFiles(optional boolean recursiveFlag = false);
+};