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diff --git a/dom/webidl/WebXR.webidl b/dom/webidl/WebXR.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://immersive-web.github.io/webxr/
+ */
+
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRSystem : EventTarget {
+  // Methods
+  [NewObject]
+  Promise<boolean> isSessionSupported(XRSessionMode mode);
+  [NewObject, NeedsCallerType]
+  Promise<XRSession> requestSession(XRSessionMode mode, optional XRSessionInit options = {});
+
+  // Events
+  attribute EventHandler ondevicechange;
+};
+
+enum XRSessionMode {
+  "inline",
+  "immersive-vr",
+  "immersive-ar",
+};
+
+dictionary XRSessionInit {
+  sequence<any> requiredFeatures;
+  sequence<any> optionalFeatures;
+};
+
+enum XRVisibilityState {
+  "visible",
+  "visible-blurred",
+  "hidden",
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRSession : EventTarget {
+  // Attributes
+  readonly attribute XRVisibilityState visibilityState;
+  [SameObject] readonly attribute XRRenderState renderState;
+  [SameObject] readonly attribute XRInputSourceArray inputSources;
+  readonly attribute float? frameRate;
+  readonly attribute Float32Array? supportedFrameRates;
+
+  // Methods
+  [Throws]
+  undefined updateRenderState(optional XRRenderStateInit state = {});
+  [NewObject]
+  Promise<XRReferenceSpace> requestReferenceSpace(XRReferenceSpaceType type);
+  [NewObject]
+  Promise<undefined> updateTargetFrameRate(float rate);
+
+  [Throws]
+  long requestAnimationFrame(XRFrameRequestCallback callback);
+  [Throws]
+  undefined cancelAnimationFrame(long handle);
+
+  [NewObject]
+  Promise<undefined> end();
+
+  // Events
+  attribute EventHandler onend;
+  attribute EventHandler oninputsourceschange;
+  attribute EventHandler onselect;
+  attribute EventHandler onselectstart;
+  attribute EventHandler onselectend;
+  attribute EventHandler onsqueeze;
+  attribute EventHandler onsqueezestart;
+  attribute EventHandler onsqueezeend;
+  attribute EventHandler onvisibilitychange;
+};
+
+dictionary XRRenderStateInit {
+  double depthNear;
+  double depthFar;
+  double inlineVerticalFieldOfView;
+  XRWebGLLayer? baseLayer;
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRRenderState {
+  readonly attribute double depthNear;
+  readonly attribute double depthFar;
+  readonly attribute double? inlineVerticalFieldOfView;
+  readonly attribute XRWebGLLayer? baseLayer;
+};
+
+callback XRFrameRequestCallback = undefined (DOMHighResTimeStamp time, XRFrame frame);
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRFrame {
+  [SameObject] readonly attribute XRSession session;
+
+  [Throws] XRViewerPose? getViewerPose(XRReferenceSpace referenceSpace);
+  [Throws] XRPose? getPose(XRSpace space, XRSpace baseSpace);
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRSpace : EventTarget {
+
+};
+
+enum XRReferenceSpaceType {
+  "viewer",
+  "local",
+  "local-floor",
+  "bounded-floor",
+  "unbounded"
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRReferenceSpace : XRSpace {
+  [NewObject]
+  XRReferenceSpace getOffsetReferenceSpace(XRRigidTransform originOffset);
+
+  attribute EventHandler onreset;
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRBoundedReferenceSpace : XRReferenceSpace {
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMPointReadOnly> boundsGeometry;
+};
+
+enum XREye {
+  "none",
+  "left",
+  "right"
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRView {
+  readonly attribute XREye eye;
+  [Throws]
+  readonly attribute Float32Array projectionMatrix;
+  [Throws, SameObject]
+  readonly attribute XRRigidTransform transform;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRViewport {
+  readonly attribute long x;
+  readonly attribute long y;
+  readonly attribute long width;
+  readonly attribute long height;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRRigidTransform {
+  [Throws]
+  constructor(optional DOMPointInit position = {}, optional DOMPointInit orientation = {});
+  [SameObject] readonly attribute DOMPointReadOnly position;
+  [SameObject] readonly attribute DOMPointReadOnly orientation;
+  [Throws]
+  readonly attribute Float32Array matrix;
+  [SameObject] readonly attribute XRRigidTransform inverse;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRPose {
+  [SameObject] readonly attribute XRRigidTransform transform;
+  readonly attribute boolean emulatedPosition;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRViewerPose : XRPose {
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<XRView> views;
+};
+
+enum XRHandedness {
+  "none",
+  "left",
+  "right"
+};
+
+enum XRTargetRayMode {
+  "gaze",
+  "tracked-pointer",
+  "screen"
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRInputSource {
+  readonly attribute XRHandedness handedness;
+  readonly attribute XRTargetRayMode targetRayMode;
+  [SameObject] readonly attribute XRSpace targetRaySpace;
+  [SameObject] readonly attribute XRSpace? gripSpace;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<DOMString> profiles;
+  // https://immersive-web.github.io/webxr-gamepads-module/
+  [SameObject] readonly attribute Gamepad? gamepad;
+};
+
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRInputSourceArray {
+  iterable<XRInputSource>;
+  readonly attribute unsigned long length;
+  getter XRInputSource(unsigned long index);
+};
+
+typedef (WebGLRenderingContext or
+         WebGL2RenderingContext) XRWebGLRenderingContext;
+
+dictionary XRWebGLLayerInit {
+  boolean antialias = true;
+  boolean depth = true;
+  boolean stencil = false;
+  boolean alpha = true;
+  boolean ignoreDepthValues = false;
+  double framebufferScaleFactor = 1.0;
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRWebGLLayer {
+  [Throws]
+  constructor(XRSession session,
+              XRWebGLRenderingContext context,
+              optional XRWebGLLayerInit layerInit = {});
+  // Attributes
+  readonly attribute boolean antialias;
+  readonly attribute boolean ignoreDepthValues;
+
+  [SameObject] readonly attribute WebGLFramebuffer? framebuffer;
+  readonly attribute unsigned long framebufferWidth;
+  readonly attribute unsigned long framebufferHeight;
+
+  // Methods
+  XRViewport? getViewport(XRView view);
+
+  // Static Methods
+  static double getNativeFramebufferScaleFactor(XRSession session);
+};