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diff --git a/dom/webidl/Screen.webidl b/dom/webidl/Screen.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/. */
+
+[Exposed=Window]
+interface Screen : EventTarget {
+  // CSSOM-View
+  // http://dev.w3.org/csswg/cssom-view/#the-screen-interface
+  readonly attribute long availWidth;
+  readonly attribute long availHeight;
+  readonly attribute long width;
+  readonly attribute long height;
+  readonly attribute long colorDepth;
+  readonly attribute long pixelDepth;
+
+  readonly attribute long top;
+  readonly attribute long left;
+  readonly attribute long availTop;
+  readonly attribute long availLeft;
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Returns the current screen orientation.
+   * Can be: landscape-primary, landscape-secondary,
+   *         portrait-primary or portrait-secondary.
+   */
+  [NeedsCallerType]
+  readonly attribute DOMString mozOrientation;
+
+  attribute EventHandler onmozorientationchange;
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Lock/unlock screen orientation to the specified type.
+   *
+   * FIXME(emilio): These do literally nothing, we should
+   * try to remove these.
+   */
+  boolean mozLockOrientation(DOMString orientation);
+  boolean mozLockOrientation(sequence<DOMString> orientation);
+  undefined mozUnlockOrientation();
+};
+
+// https://w3c.github.io/screen-orientation
+partial interface Screen {
+  readonly attribute ScreenOrientation orientation;
+};
+
+// https://wicg.github.io/media-capabilities/#idl-index
+enum ScreenColorGamut {
+  "srgb",
+  "p3",
+  "rec2020",
+};
+
+[Func="nsScreen::MediaCapabilitiesEnabled",
+ Exposed=Window]
+interface ScreenLuminance {
+  readonly attribute double min;
+  readonly attribute double max;
+  readonly attribute double maxAverage;
+};
+
+partial interface Screen {
+  [Func="nsScreen::MediaCapabilitiesEnabled"]
+  readonly attribute ScreenColorGamut colorGamut;
+  [Func="nsScreen::MediaCapabilitiesEnabled"]
+  readonly attribute ScreenLuminance? luminance;
+
+  [Func="nsScreen::MediaCapabilitiesEnabled"]
+  attribute EventHandler onchange;
+};