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diff --git a/dom/webidl/AnonymousContent.webidl b/dom/webidl/AnonymousContent.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/.
+ */
+
+/*
+ * This file declares the AnonymousContent interface which is used to
+ * manipulate content that has been inserted into the document's canvasFrame
+ * anonymous container.
+ * See Document.insertAnonymousContent.
+ *
+ * This API never returns a reference to the actual inserted DOM node on
+ * purpose. This is to make sure the content cannot be randomly changed and the
+ * DOM cannot be traversed from the node, so that Gecko can remain in control of
+ * the inserted content.
+ */
+
+[ChromeOnly, Exposed=Window]
+interface AnonymousContent {
+  /**
+   * Get the text content of an element inside this custom anonymous content.
+   */
+  [Throws]
+  DOMString getTextContentForElement(DOMString elementId);
+
+  /**
+   * Set the text content of an element inside this custom anonymous content.
+   */
+  [Throws]
+  void setTextContentForElement(DOMString elementId, DOMString text);
+
+  /**
+   * Get the value of an attribute of an element inside this custom anonymous
+   * content.
+   */
+  [Throws]
+  DOMString? getAttributeForElement(DOMString elementId,
+                                    DOMString attributeName);
+
+  /**
+   * Set the value of an attribute of an element inside this custom anonymous
+   * content.
+   */
+  [NeedsSubjectPrincipal=NonSystem, Throws]
+  void setAttributeForElement(DOMString elementId,
+                              DOMString attributeName,
+                              DOMString value);
+
+  /**
+   * Remove an attribute from an element inside this custom anonymous content.
+   */
+  [Throws]
+  void removeAttributeForElement(DOMString elementId,
+                                 DOMString attributeName);
+
+  /**
+   * Get the canvas' context for the element specified if it's a <canvas>
+   * node, `null` otherwise.
+   */
+  [Throws]
+  nsISupports? getCanvasContext(DOMString elementId,
+                                DOMString contextId);
+
+  [Throws]
+  Animation setAnimationForElement(DOMString elementId,
+                                   object? keyframes,
+                                   optional UnrestrictedDoubleOrKeyframeAnimationOptions
+                                     options = {});
+
+  /**
+   * Accepts a list of (possibly overlapping) DOMRects which describe a shape
+   * in CSS pixels relative to the element's border box. This shape will be
+   * excluded from the element's background color rendering. The element will
+   * not render any background images once this method has been called.
+   */
+  [Throws]
+  void setCutoutRectsForElement(DOMString elementId,
+                                sequence<DOMRect> rects);
+
+  /**
+   * Get the computed value of a property on an element inside this custom
+   * anonymous content.
+   */
+  [Throws]
+  UTF8String? getComputedStylePropertyValue(DOMString elementId,
+                                           UTF8String propertyName);
+
+  /**
+   * If event's original target is in the anonymous content, this returns the id
+   * attribute value of the target.
+   */
+  DOMString? getTargetIdForEvent(Event event);
+
+  /**
+   * Set given style to this AnonymousContent.
+   */
+  [Throws]
+  void setStyle(UTF8String property, UTF8String value);
+};