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diff --git a/dom/webidl/PresentationRequest.webidl b/dom/webidl/PresentationRequest.webidl
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+++ b/dom/webidl/PresentationRequest.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/presentation-api/#interface-presentationrequest
+ */
+
+[Constructor(DOMString url),
+ Constructor(sequence<DOMString> urls),
+ Pref="dom.presentation.controller.enabled"]
+interface PresentationRequest : EventTarget {
+  /*
+   * A requesting page use start() to start a new connection, and it will be
+   * returned with the promise. UA may show a prompt box with a list of
+   * available devices and ask the user to grant permission, choose a device, or
+   * cancel the operation.
+   *
+   * The promise is resolved when the presenting page is successfully loaded and
+   * the communication channel is established, i.e., the connection state is
+   * "connected".
+   *
+   * The promise may be rejected duo to one of the following reasons:
+   * - "OperationError": Unexpected error occurs.
+   * - "NotFoundError":  No available device.
+   * - "AbortError":     User dismiss/cancel the device prompt box.
+   * - "NetworkError":   Failed to establish the control channel or data channel.
+   * - "TimeoutError":   Presenting page takes too long to load.
+   * - "SecurityError":  This operation is insecure.
+   */
+  [Throws]
+  Promise<PresentationConnection> start();
+
+  /*
+   * A requesting page can use reconnect(presentationId) to reopen a
+   * non-terminated presentation connection.
+   *
+   * The promise is resolved when a new presentation connection is created.
+   * The connection state is "connecting".
+   *
+   * The promise may be rejected duo to one of the following reasons:
+   * - "OperationError": Unexpected error occurs.
+   * - "NotFoundError":  Can not find a presentation connection with the presentationId.
+   * - "SecurityError":  This operation is insecure.
+   */
+  [Throws]
+  Promise<PresentationConnection> reconnect(DOMString presentationId);
+
+ /*
+  * UA triggers device discovery mechanism periodically and monitor device
+  * availability.
+  *
+  * The promise may be rejected duo to one of the following reasons:
+  * - "NotSupportedError": Unable to continuously monitor the availability.
+  * - "SecurityError":  This operation is insecure.
+  */
+  [Throws]
+  Promise<PresentationAvailability> getAvailability();
+
+  /*
+   * It is called when a connection associated with a PresentationRequest is created.
+   * The event is fired for all connections that are created for the controller.
+   */
+  attribute EventHandler onconnectionavailable;
+
+  /*
+   * A chrome page, or page which has presentation-device-manage permissiongs,
+   * uses startWithDevice() to start a new connection with specified device,
+   * and it will be returned with the promise. UA may show a prompt box with a
+   * list of available devices and ask the user to grant permission, choose a
+   * device, or cancel the operation.
+   *
+   * The promise is resolved when the presenting page is successfully loaded and
+   * the communication channel is established, i.e., the connection state is
+   * "connected".
+   *
+   * The promise may be rejected duo to one of the following reasons:
+   * - "OperationError": Unexpected error occurs.
+   * - "NotFoundError":  No available device.
+   * - "NetworkError":   Failed to establish the control channel or data channel.
+   * - "TimeoutError":   Presenting page takes too long to load.
+   */
+  [ChromeOnly, Throws]
+  Promise<PresentationConnection> startWithDevice(DOMString deviceId);
+};