--- a/dom/webidl/Attr.webidl
+++ b/dom/webidl/Attr.webidl
@@ -7,17 +7,17 @@
  * http://www.w3.org/TR/2012/WD-dom-20120105/
  *
  * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
  * liability, trademark and document use rules apply.
  */
 
 interface Attr : Node {
   readonly attribute DOMString localName;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString value;
 
   [Constant]
   readonly attribute DOMString name;
   [Constant]
   readonly attribute DOMString? namespaceURI;
   [Constant]
   readonly attribute DOMString? prefix;

--- a/dom/webidl/ChildNode.webidl
+++ b/dom/webidl/ChildNode.webidl
@@ -4,23 +4,23 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/.
  *
  * The origin of this IDL file is
  * http://dom.spec.whatwg.org/#interface-childnode
  */
 
 [NoInterfaceObject]
 interface ChildNode {
-  [Throws, Unscopable]
+  [CEReactions, Throws, Unscopable]
   void before((Node or DOMString)... nodes);
-  [Throws, Unscopable]
+  [CEReactions, Throws, Unscopable]
   void after((Node or DOMString)... nodes);
-  [Throws, Unscopable]
+  [CEReactions, Throws, Unscopable]
   void replaceWith((Node or DOMString)... nodes);
-  [Unscopable]
+  [CEReactions, Unscopable]
   void remove();
 };
 
 [NoInterfaceObject]
 interface NonDocumentTypeChildNode {
   [Pure]
   readonly attribute Element? previousElementSibling;
   [Pure]

--- a/dom/webidl/DOMTokenList.webidl
+++ b/dom/webidl/DOMTokenList.webidl
@@ -9,23 +9,23 @@
  * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
  * liability, trademark and document use rules apply.
  */
 
 interface DOMTokenList {
   readonly attribute unsigned long length;
   getter DOMString? item(unsigned long index);
   boolean contains(DOMString token);
-  [Throws]
+  [CEReactions, Throws]
   void add(DOMString... tokens);
-  [Throws]
+  [CEReactions, Throws]
   void remove(DOMString... tokens);
-  [Throws]
+  [CEReactions, Throws]
   void replace(DOMString token, DOMString newToken);
-  [Throws]
+  [CEReactions, Throws]
   boolean toggle(DOMString token, optional boolean force);
   [Throws]
   boolean supports(DOMString token);
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString value;
   stringifier DOMString ();
   iterable<DOMString?>;
 };

--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -63,19 +63,19 @@ interface Document : Node {
   DocumentFragment createDocumentFragment();
   [NewObject]
   Text createTextNode(DOMString data);
   [NewObject]
   Comment createComment(DOMString data);
   [NewObject, Throws]
   ProcessingInstruction createProcessingInstruction(DOMString target, DOMString data);
 
-  [Throws]
+  [CEReactions, Throws]
   Node importNode(Node node, optional boolean deep = false);
-  [Throws]
+  [CEReactions, Throws]
   Node adoptNode(Node node);
 
   [NewObject, Throws, NeedsCallerType]
   Event createEvent(DOMString interface);
 
   [NewObject, Throws]
   Range createRange();
 

--- a/dom/webidl/Element.webidl
+++ b/dom/webidl/Element.webidl
@@ -20,38 +20,38 @@ interface Element : Node {
   readonly attribute DOMString? prefix;
   [Constant]
   readonly attribute DOMString localName;
 
   // Not [Constant] because it depends on which document we're in
   [Pure]
   readonly attribute DOMString tagName;
 
-  [Pure]
+  [CEReactions, Pure]
            attribute DOMString id;
-  [Pure]
+  [CEReactions, Pure]
            attribute DOMString className;
   [Constant, PutForwards=value]
   readonly attribute DOMTokenList classList;
 
   [SameObject]
   readonly attribute NamedNodeMap attributes;
   [Pure]
   sequence<DOMString> getAttributeNames();
   [Pure]
   DOMString? getAttribute(DOMString name);
   [Pure]
   DOMString? getAttributeNS(DOMString? namespace, DOMString localName);
-  [Throws]
+  [CEReactions, Throws]
   void setAttribute(DOMString name, DOMString value);
-  [Throws]
+  [CEReactions, Throws]
   void setAttributeNS(DOMString? namespace, DOMString name, DOMString value);
-  [Throws]
+  [CEReactions, Throws]
   void removeAttribute(DOMString name);
-  [Throws]
+  [CEReactions, Throws]
   void removeAttributeNS(DOMString? namespace, DOMString localName);
   [Pure]
   boolean hasAttribute(DOMString name);
   [Pure]
   boolean hasAttributeNS(DOMString? namespace, DOMString localName);
   [Pure]
   boolean hasAttributes();
 
@@ -65,17 +65,17 @@ interface Element : Node {
 
   [Pure]
   HTMLCollection getElementsByTagName(DOMString localName);
   [Throws, Pure]
   HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
   [Pure]
   HTMLCollection getElementsByClassName(DOMString classNames);
 
-  [Throws, Pure]
+  [CEReactions, Throws, Pure]
   Element? insertAdjacentElement(DOMString where, Element element); // historical
 
   [Throws]
   void insertAdjacentText(DOMString where, DOMString data); // historical
 
   /**
    * The ratio of font-size-inflated text font size to computed font
    * size for this element. This will query the element for its primary frame,
@@ -136,22 +136,22 @@ interface Element : Node {
    */
   [ChromeOnly]
   void setCaptureAlways(optional boolean retargetToElement = false);
 
   // Mozilla extensions
 
   // Obsolete methods.
   Attr? getAttributeNode(DOMString name);
-  [Throws]
+  [CEReactions, Throws]
   Attr? setAttributeNode(Attr newAttr);
-  [Throws]
+  [CEReactions, Throws]
   Attr? removeAttributeNode(Attr oldAttr);
   Attr? getAttributeNodeNS(DOMString? namespaceURI, DOMString localName);
-  [Throws]
+  [CEReactions, Throws]
   Attr? setAttributeNodeNS(Attr newAttr);
 
   [ChromeOnly]
   /**
    * Scrolls the element by (dx, dy) CSS pixels without doing any
    * layout flushing.
    */
   boolean scrollByNoFlush(long dx, long dy);

--- a/dom/webidl/NamedNodeMap.webidl
+++ b/dom/webidl/NamedNodeMap.webidl
@@ -1,22 +1,22 @@
 /* -*- 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/. */
 
 [LegacyUnenumerableNamedProperties]
 interface NamedNodeMap {
   getter Attr? getNamedItem(DOMString name);
-  [Throws, BinaryName="setNamedItemNS"]
+  [CEReactions, Throws, BinaryName="setNamedItemNS"]
   Attr? setNamedItem(Attr arg);
-  [Throws]
+  [CEReactions, Throws]
   Attr removeNamedItem(DOMString name);
 
   getter Attr? item(unsigned long index);
   readonly attribute unsigned long length;
 
   Attr? getNamedItemNS(DOMString? namespaceURI, DOMString localName);
-  [Throws]
+  [CEReactions, Throws]
   Attr? setNamedItemNS(Attr arg);
-  [Throws]
+  [CEReactions, Throws]
   Attr removeNamedItemNS(DOMString? namespaceURI, DOMString localName);
 };

--- a/dom/webidl/Node.webidl
+++ b/dom/webidl/Node.webidl
@@ -52,31 +52,32 @@ interface Node : EventTarget {
   readonly attribute Node? firstChild;
   [Pure]
   readonly attribute Node? lastChild;
   [Pure]
   readonly attribute Node? previousSibling;
   [Pure]
   readonly attribute Node? nextSibling;
 
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString? nodeValue;
-  [SetterThrows, GetterCanOOM, Pure]
+  [CEReactions, SetterThrows, GetterCanOOM, Pure]
            attribute DOMString? textContent;
-  [Throws]
+  [CEReactions, Throws]
   Node insertBefore(Node node, Node? child);
-  [Throws]
+  [CEReactions, Throws]
   Node appendChild(Node node);
-  [Throws]
+  [CEReactions, Throws]
   Node replaceChild(Node node, Node child);
-  [Throws]
+  [CEReactions, Throws]
   Node removeChild(Node child);
+  [CEReactions]
   void normalize();
 
-  [Throws]
+  [CEReactions, Throws]
   Node cloneNode(optional boolean deep = false);
   [Pure]
   boolean isSameNode(Node? node);
   [Pure]
   boolean isEqualNode(Node? node);
 
   const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01;
   const unsigned short DOCUMENT_POSITION_PRECEDING = 0x02;

--- a/dom/webidl/ParentNode.webidl
+++ b/dom/webidl/ParentNode.webidl
@@ -13,13 +13,13 @@ interface ParentNode {
   readonly attribute HTMLCollection children;
   [Pure]
   readonly attribute Element? firstElementChild;
   [Pure]
   readonly attribute Element? lastElementChild;
   [Pure]
   readonly attribute unsigned long childElementCount;
 
-  [Throws, Unscopable]
+  [CEReactions, Throws, Unscopable]
   void prepend((Node or DOMString)... nodes);
-  [Throws, Unscopable]
+  [CEReactions, Throws, Unscopable]
   void append((Node or DOMString)... nodes);
 };

--- a/dom/webidl/Range.webidl
+++ b/dom/webidl/Range.webidl
@@ -46,25 +46,25 @@ interface Range {
   void selectNodeContents(Node refNode);
 
   const unsigned short START_TO_START = 0;
   const unsigned short START_TO_END = 1;
   const unsigned short END_TO_END = 2;
   const unsigned short END_TO_START = 3;
   [Throws]
   short compareBoundaryPoints(unsigned short how, Range sourceRange);
-  [Throws]
+  [CEReactions, Throws]
   void deleteContents();
-  [Throws]
+  [CEReactions, Throws]
   DocumentFragment extractContents();
-  [Throws]
+  [CEReactions, Throws]
   DocumentFragment cloneContents();
-  [Throws]
+  [CEReactions, Throws]
   void insertNode(Node node);
-  [Throws]
+  [CEReactions, Throws]
   void surroundContents(Node newParent);
 
   Range cloneRange();
   void detach();
 
   [Throws]
   boolean isPointInRange(Node node, unsigned long offset);
   [Throws]