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diff --git a/dom/webidl/Clipboard.webidl b/dom/webidl/Clipboard.webidl
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+++ b/dom/webidl/Clipboard.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/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/clipboard-apis/
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+typedef sequence<ClipboardItem> ClipboardItems;
+
+[SecureContext, Exposed=Window]
+interface Clipboard : EventTarget {
+  [Pref="dom.events.asyncClipboard.clipboardItem", NewObject, NeedsSubjectPrincipal]
+  Promise<ClipboardItems> read();
+  [Func="Clipboard::ReadTextEnabled", NewObject, NeedsSubjectPrincipal]
+  Promise<DOMString> readText();
+
+  [Pref="dom.events.asyncClipboard.clipboardItem", NewObject, NeedsSubjectPrincipal]
+  Promise<undefined> write(ClipboardItems data);
+
+  [NewObject, NeedsSubjectPrincipal]
+  Promise<undefined> writeText(DOMString data);
+};
+
+partial interface Clipboard {
+  // @param allowed true, if the user allowed (e.g. clicked) the "Paste" menuitem.
+  //                false, when the menupopup was dismissed.
+  [ChromeOnly]
+  undefined onUserReactedToPasteMenuPopup(boolean allowed);
+};
+
+typedef (DOMString or Blob) ClipboardItemDataType;
+typedef Promise<ClipboardItemDataType> ClipboardItemData;
+// callback ClipboardItemDelayedCallback = ClipboardItemData ();
+
+[SecureContext, Exposed=Window, Pref="dom.events.asyncClipboard.clipboardItem"]
+interface ClipboardItem {
+  [Throws]
+  constructor(record<DOMString, ClipboardItemData> items,
+              optional ClipboardItemOptions options = {});
+
+  // static ClipboardItem createDelayed(
+  //     record<DOMString, ClipboardItemDelayedCallback> items,
+  //     optional ClipboardItemOptions options = {});
+
+  readonly attribute PresentationStyle presentationStyle;
+  // readonly attribute long long lastModified;
+  // readonly attribute boolean delayed;
+
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  // readonly attribute FrozenArray<DOMString> types;
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMString> types;
+
+  [NewObject]
+  Promise<Blob> getType(DOMString type);
+};
+
+enum PresentationStyle { "unspecified", "inline", "attachment" };
+
+dictionary ClipboardItemOptions {
+  PresentationStyle presentationStyle = "unspecified";
+};