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diff --git a/dom/webidl/GeometryUtils.webidl b/dom/webidl/GeometryUtils.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
+ * http://dev.w3.org/csswg/cssom-view/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum CSSBoxType { "margin", "border", "padding", "content" };
+dictionary BoxQuadOptions {
+  CSSBoxType box = "border";
+  GeometryNode relativeTo;
+  [ChromeOnly]
+  boolean createFramesForSuppressedWhitespace = true;
+};
+
+dictionary ConvertCoordinateOptions {
+  CSSBoxType fromBox = "border";
+  CSSBoxType toBox = "border";
+};
+
+interface mixin GeometryUtils {
+  [Throws, Func="nsINode::HasBoxQuadsSupport", NeedsCallerType]
+  sequence<DOMQuad> getBoxQuads(optional BoxQuadOptions options = {});
+
+  /* getBoxQuadsFromWindowOrigin is similar to getBoxQuads, but the
+   * returned quads are further translated relative to the window
+   * origin -- which is not the layout origin. Further translation
+   * must be done to bring the quads into layout space. Typically,
+   * this will be done by performing another call from the top level
+   * browser process, requesting the quad of the top level content
+   * document itself. The position of this quad can then be used as
+   * the offset into layout space, and subtracted from the original
+   * returned quads. If options.relativeTo is supplied, this method
+   * will throw.
+   */
+  [ChromeOnly, Throws, Func="nsINode::HasBoxQuadsSupport"]
+  sequence<DOMQuad> getBoxQuadsFromWindowOrigin(optional BoxQuadOptions options = {});
+
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMQuad convertQuadFromNode(DOMQuad quad, GeometryNode from, optional ConvertCoordinateOptions options = {});
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMQuad convertRectFromNode(DOMRectReadOnly rect, GeometryNode from, optional ConvertCoordinateOptions options = {});
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMPoint convertPointFromNode(DOMPointInit point, GeometryNode from, optional ConvertCoordinateOptions options = {});
+};
+
+// PseudoElement includes GeometryUtils;
+
+typedef (Text or Element /* or PseudoElement */ or Document) GeometryNode;