Bug 1340027 - Part 2: Add HTML CEReactions annotation.

Tag UXP Issue #1344

68 files changed, 398 insertions, 359 deletions

diff --git a/dom/webidl/DOMStringMap.webidl b/dom/webidl/DOMStringMap.webidl
index 0ed98e148a..a59910e0b5 100644
--- a/dom/webidl/DOMStringMap.webidl
+++ b/dom/webidl/DOMStringMap.webidl
@@ -14,7 +14,8 @@
 [OverrideBuiltins]
 interface DOMStringMap {
   getter DOMString (DOMString name);
-  [Throws]
+  [CEReactions, Throws]
   setter creator void (DOMString name, DOMString value);
+  [CEReactions]
   deleter void (DOMString name);
 };
diff --git a/dom/webidl/Document.webidl b/dom/webidl/Document.webidl
index 0703ecd70f..b28903ae23 100644
--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -108,9 +108,9 @@ partial interface Document {
 
   // DOM tree accessors
   //(Not proxy yet)getter object (DOMString name);
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString title;
-  [Pure]
+  [CEReactions, Pure]
            attribute DOMString dir;
   //(HTML only)         attribute HTMLElement? body;
   //(HTML only)readonly attribute HTMLHeadElement? head;
diff --git a/dom/webidl/HTMLAnchorElement.webidl b/dom/webidl/HTMLAnchorElement.webidl
index aa8e7d0821..0326dff6a9 100644
--- a/dom/webidl/HTMLAnchorElement.webidl
+++ b/dom/webidl/HTMLAnchorElement.webidl
@@ -14,24 +14,24 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-a-element
 [HTMLConstructor]
 interface HTMLAnchorElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString target;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString download;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString ping;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString rel;
-           [SetterThrows, Pref="network.http.enablePerElementReferrer"]
+           [CEReactions, SetterThrows, Pref="network.http.enablePerElementReferrer"]
            attribute DOMString referrerPolicy;
            [PutForwards=value]
   readonly attribute DOMTokenList relList;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString hreflang;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString type;
 
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString text;
 };
 
@@ -39,14 +39,14 @@ HTMLAnchorElement implements HTMLHyperlinkElementUtils;
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLAnchorElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString coords;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString charset;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString name;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString rev;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString shape;
 };
diff --git a/dom/webidl/HTMLAreaElement.webidl b/dom/webidl/HTMLAreaElement.webidl
index 113f1822ec..0980d178aa 100644
--- a/dom/webidl/HTMLAreaElement.webidl
+++ b/dom/webidl/HTMLAreaElement.webidl
@@ -15,19 +15,19 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-area-element
 [HTMLConstructor]
 interface HTMLAreaElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString alt;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString coords;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString shape;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString target;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString download;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString ping;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString rel;
            [SetterThrows, Pref="network.http.enablePerElementReferrer"]
            attribute DOMString referrerPolicy;
@@ -39,6 +39,6 @@ HTMLAreaElement implements HTMLHyperlinkElementUtils;
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLAreaElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean noHref;
 };
diff --git a/dom/webidl/HTMLBRElement.webidl b/dom/webidl/HTMLBRElement.webidl
index 07b8d9f0d9..b0b0f80ede 100644
--- a/dom/webidl/HTMLBRElement.webidl
+++ b/dom/webidl/HTMLBRElement.webidl
@@ -18,7 +18,7 @@ interface HTMLBRElement : HTMLElement {};
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLBRElement {
-             [SetterThrows]
+             [CEReactions, SetterThrows]
              attribute DOMString clear;
 };
 
diff --git a/dom/webidl/HTMLBaseElement.webidl b/dom/webidl/HTMLBaseElement.webidl
index bc43e0570d..ed86f8c77d 100644
--- a/dom/webidl/HTMLBaseElement.webidl
+++ b/dom/webidl/HTMLBaseElement.webidl
@@ -14,9 +14,9 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-base-element
 [HTMLConstructor]
 interface HTMLBaseElement : HTMLElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString href;
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString target;
 };
 
diff --git a/dom/webidl/HTMLBodyElement.webidl b/dom/webidl/HTMLBodyElement.webidl
index e177584913..f89c287d72 100644
--- a/dom/webidl/HTMLBodyElement.webidl
+++ b/dom/webidl/HTMLBodyElement.webidl
@@ -16,12 +16,18 @@ interface HTMLBodyElement : HTMLElement {
 };
 
 partial interface HTMLBodyElement {
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString text;
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString link;
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString vLink;
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString aLink;
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString bgColor;
-  [SetterThrows]                          attribute DOMString background;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString text;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString link;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString vLink;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString aLink;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString bgColor;
+  [CEReactions, SetterThrows]
+  attribute DOMString background;
 };
 
 HTMLBodyElement implements WindowEventHandlers;
diff --git a/dom/webidl/HTMLButtonElement.webidl b/dom/webidl/HTMLButtonElement.webidl
index 5d7965cfb2..f129dbd7b5 100644
--- a/dom/webidl/HTMLButtonElement.webidl
+++ b/dom/webidl/HTMLButtonElement.webidl
@@ -13,27 +13,27 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-button-element
 [HTMLConstructor]
 interface HTMLButtonElement : HTMLElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean autofocus;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean disabled;
   [Pure]
   readonly attribute HTMLFormElement? form;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString formAction;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString formEnctype;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString formMethod;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean formNoValidate;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString formTarget;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString type;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString value;
 // Not yet implemented:
 //           attribute HTMLMenuElement? menu;
diff --git a/dom/webidl/HTMLCanvasElement.webidl b/dom/webidl/HTMLCanvasElement.webidl
index 4a0c4499bb..b567c69eba 100644
--- a/dom/webidl/HTMLCanvasElement.webidl
+++ b/dom/webidl/HTMLCanvasElement.webidl
@@ -15,9 +15,9 @@ interface Variant;
 
 [HTMLConstructor]
 interface HTMLCanvasElement : HTMLElement {
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute unsigned long width;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute unsigned long height;
 
   [Throws]
diff --git a/dom/webidl/HTMLDListElement.webidl b/dom/webidl/HTMLDListElement.webidl
index 4e3fa88d81..4cf1c21831 100644
--- a/dom/webidl/HTMLDListElement.webidl
+++ b/dom/webidl/HTMLDListElement.webidl
@@ -19,6 +19,6 @@ interface HTMLDListElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLDListElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean compact;
 };
diff --git a/dom/webidl/HTMLDataElement.webidl b/dom/webidl/HTMLDataElement.webidl
index 6b9a7f19ad..d245378714 100644
--- a/dom/webidl/HTMLDataElement.webidl
+++ b/dom/webidl/HTMLDataElement.webidl
@@ -9,6 +9,6 @@
 
 [HTMLConstructor]
 interface HTMLDataElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString value;
 };
diff --git a/dom/webidl/HTMLDetailsElement.webidl b/dom/webidl/HTMLDetailsElement.webidl
index f57f5c93c7..04df82e30f 100644
--- a/dom/webidl/HTMLDetailsElement.webidl
+++ b/dom/webidl/HTMLDetailsElement.webidl
@@ -13,6 +13,6 @@
 
 [HTMLConstructor]
 interface HTMLDetailsElement : HTMLElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute boolean open;
 };
diff --git a/dom/webidl/HTMLDialogElement.webidl b/dom/webidl/HTMLDialogElement.webidl
index b6cdbacf68..563740c874 100644
--- a/dom/webidl/HTMLDialogElement.webidl
+++ b/dom/webidl/HTMLDialogElement.webidl
@@ -13,11 +13,13 @@
 
 [Pref="dom.dialog_element.enabled"]
 interface HTMLDialogElement : HTMLElement {
-  [SetterThrows] attribute boolean open;
+  [CEReactions, SetterThrows]
+  attribute boolean open;
   attribute DOMString returnValue;
-
+  [CEReactions]
   void show();
-  [Throws] void showModal();
-
+  [CEReactions, Throws]
+  void showModal();
+  [CEReactions]
   void close(optional DOMString returnValue);
 };
diff --git a/dom/webidl/HTMLDirectoryElement.webidl b/dom/webidl/HTMLDirectoryElement.webidl
index d50b4d330b..65becbb605 100644
--- a/dom/webidl/HTMLDirectoryElement.webidl
+++ b/dom/webidl/HTMLDirectoryElement.webidl
@@ -14,7 +14,7 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 [HTMLConstructor]
 interface HTMLDirectoryElement : HTMLElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute boolean compact;
 };
 
diff --git a/dom/webidl/HTMLDivElement.webidl b/dom/webidl/HTMLDivElement.webidl
index 584c01e0e3..2b762c6faa 100644
--- a/dom/webidl/HTMLDivElement.webidl
+++ b/dom/webidl/HTMLDivElement.webidl
@@ -15,6 +15,6 @@
 interface HTMLDivElement : HTMLElement {};
 
 partial interface HTMLDivElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute DOMString align;
 };
diff --git a/dom/webidl/HTMLDocument.webidl b/dom/webidl/HTMLDocument.webidl
index ffb61ccdd9..ffa38d97d0 100644
--- a/dom/webidl/HTMLDocument.webidl
+++ b/dom/webidl/HTMLDocument.webidl
@@ -13,7 +13,7 @@ interface HTMLDocument : Document {
   // DOM tree accessors
   [Throws]
   getter object (DOMString name);
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute HTMLElement? body;
   [Pure]
   readonly attribute HTMLHeadElement? head;
@@ -32,20 +32,20 @@ interface HTMLDocument : Document {
   NodeList getElementsByName(DOMString elementName);
 
   // dynamic markup insertion
-  [Throws]
+  [CEReactions, Throws]
   Document open(optional DOMString type = "text/html", optional DOMString replace = "");
-  [Throws]
+  [CEReactions, Throws]
   WindowProxy? open(DOMString url, DOMString name, DOMString features, optional boolean replace = false);
-  [Throws]
+  [CEReactions, Throws]
   void close();
-  [Throws]
+  [CEReactions, Throws]
   void write(DOMString... text);
-  [Throws]
+  [CEReactions, Throws]
   void writeln(DOMString... text);
 
-  [SetterThrows, NeedsSubjectPrincipal]
+  [CEReactions, SetterThrows, NeedsSubjectPrincipal]
            attribute DOMString designMode;
-  [Throws]
+  [CEReactions, Throws]
   boolean execCommand(DOMString commandId, optional boolean showUI = false,
                       optional DOMString value = "");
   [Throws]
@@ -58,11 +58,11 @@ interface HTMLDocument : Document {
   [Throws]
   DOMString queryCommandValue(DOMString commandId);
 
-  [TreatNullAs=EmptyString] attribute DOMString fgColor;
-  [TreatNullAs=EmptyString] attribute DOMString linkColor;
-  [TreatNullAs=EmptyString] attribute DOMString vlinkColor;
-  [TreatNullAs=EmptyString] attribute DOMString alinkColor;
-  [TreatNullAs=EmptyString] attribute DOMString bgColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString fgColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString linkColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString vlinkColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString alinkColor;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString bgColor;
 
   [Pure]
   readonly attribute HTMLCollection anchors;
diff --git a/dom/webidl/HTMLElement.webidl b/dom/webidl/HTMLElement.webidl
index 890341ec0e..815f4a3bd0 100644
--- a/dom/webidl/HTMLElement.webidl
+++ b/dom/webidl/HTMLElement.webidl
@@ -15,32 +15,34 @@
 [HTMLConstructor]
 interface HTMLElement : Element {
   // metadata attributes
+  [CEReactions]
            attribute DOMString title;
+  [CEReactions]
            attribute DOMString lang;
   //         attribute boolean translate;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString dir;
   [Constant]
   readonly attribute DOMStringMap dataset;
 
-  [GetterThrows, Pure, TreatNullAs=EmptyString]
+  [CEReactions, GetterThrows, Pure, TreatNullAs=EmptyString]
            attribute DOMString innerText;
 
   // user interaction
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean hidden;
   void click();
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute long tabIndex;
   [Throws]
   void focus();
   [Throws]
   void blur();
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString accessKey;
   [Pure]
   readonly attribute DOMString accessKeyLabel;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean draggable;
   //[PutForwards=value] readonly attribute DOMTokenList dropzone;
   [SetterThrows, Pure]
@@ -51,7 +53,7 @@ interface HTMLElement : Element {
   readonly attribute HTMLMenuElement? contextMenu;
   //[SetterThrows]
   //         attribute HTMLMenuElement? contextMenu;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean spellcheck;
 
   // command API
diff --git a/dom/webidl/HTMLEmbedElement.webidl b/dom/webidl/HTMLEmbedElement.webidl
index d4e678011b..9c53612219 100644
--- a/dom/webidl/HTMLEmbedElement.webidl
+++ b/dom/webidl/HTMLEmbedElement.webidl
@@ -15,13 +15,13 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-embed-element
 [HTMLConstructor, NeedResolve]
 interface HTMLEmbedElement : HTMLElement {
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString src;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString type;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString width;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString height;
   [Throws]
   legacycaller any (any... arguments);
@@ -29,9 +29,9 @@ interface HTMLEmbedElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#HTMLEmbedElement-partial
 partial interface HTMLEmbedElement {
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString align;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString name;
 };
 
diff --git a/dom/webidl/HTMLFieldSetElement.webidl b/dom/webidl/HTMLFieldSetElement.webidl
index f61cdbf5b2..63393bf429 100644
--- a/dom/webidl/HTMLFieldSetElement.webidl
+++ b/dom/webidl/HTMLFieldSetElement.webidl
@@ -13,10 +13,10 @@
 
 [HTMLConstructor]
 interface HTMLFieldSetElement : HTMLElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute DOMString name;
 
   readonly attribute DOMString type;
diff --git a/dom/webidl/HTMLFontElement.webidl b/dom/webidl/HTMLFontElement.webidl
index 09c0eae9bf..8db6d32466 100644
--- a/dom/webidl/HTMLFontElement.webidl
+++ b/dom/webidl/HTMLFontElement.webidl
@@ -13,7 +13,7 @@
 
 [HTMLConstructor]
 interface HTMLFontElement : HTMLElement {
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString color;
-  [SetterThrows]                          attribute DOMString face;
-  [SetterThrows]                          attribute DOMString size;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows] attribute DOMString color;
+  [CEReactions, SetterThrows]                          attribute DOMString face;
+  [CEReactions, SetterThrows]                          attribute DOMString size;
 };
diff --git a/dom/webidl/HTMLFormElement.webidl b/dom/webidl/HTMLFormElement.webidl
index dcc9094834..064fe9fade 100644
--- a/dom/webidl/HTMLFormElement.webidl
+++ b/dom/webidl/HTMLFormElement.webidl
@@ -13,23 +13,23 @@
 
 [OverrideBuiltins, LegacyUnenumerableNamedProperties, HTMLConstructor]
 interface HTMLFormElement : HTMLElement {
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString acceptCharset;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString action;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString autocomplete;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString enctype;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString encoding;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString method;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString name;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute boolean noValidate;
-           [Pure, SetterThrows]
+           [CEReactions, Pure, SetterThrows]
            attribute DOMString target;
 
   [Constant]
@@ -43,6 +43,7 @@ interface HTMLFormElement : HTMLElement {
 
   [Throws]
   void submit();
+  [CEReactions]
   void reset();
   boolean checkValidity();
   boolean reportValidity();
diff --git a/dom/webidl/HTMLFrameElement.webidl b/dom/webidl/HTMLFrameElement.webidl
index e7d7021435..c3ba0de635 100644
--- a/dom/webidl/HTMLFrameElement.webidl
+++ b/dom/webidl/HTMLFrameElement.webidl
@@ -13,24 +13,26 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#htmlframeelement
 [HTMLConstructor]
 interface HTMLFrameElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString name;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString scrolling;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString src;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString frameBorder;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString longDesc;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean noResize;
   [NeedsSubjectPrincipal]
   readonly attribute Document? contentDocument;
   readonly attribute WindowProxy? contentWindow;
 
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString marginHeight;
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString marginWidth;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString marginHeight;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+  attribute DOMString marginWidth;
 };
 
 HTMLFrameElement implements MozFrameLoaderOwner;
diff --git a/dom/webidl/HTMLFrameSetElement.webidl b/dom/webidl/HTMLFrameSetElement.webidl
index cf4e34bcf1..afc4465d18 100644
--- a/dom/webidl/HTMLFrameSetElement.webidl
+++ b/dom/webidl/HTMLFrameSetElement.webidl
@@ -13,9 +13,9 @@
 
 [HTMLConstructor]
 interface HTMLFrameSetElement : HTMLElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString cols;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString rows;
 };
 
diff --git a/dom/webidl/HTMLHRElement.webidl b/dom/webidl/HTMLHRElement.webidl
index 9359d74b99..24ba3112aa 100644
--- a/dom/webidl/HTMLHRElement.webidl
+++ b/dom/webidl/HTMLHRElement.webidl
@@ -18,14 +18,14 @@ interface HTMLHRElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLHRElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString color;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean noShade;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString size;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString width;
 };
diff --git a/dom/webidl/HTMLHeadingElement.webidl b/dom/webidl/HTMLHeadingElement.webidl
index 97e471025f..a39e24cfba 100644
--- a/dom/webidl/HTMLHeadingElement.webidl
+++ b/dom/webidl/HTMLHeadingElement.webidl
@@ -18,6 +18,6 @@ interface HTMLHeadingElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLHeadingElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
 };
diff --git a/dom/webidl/HTMLHtmlElement.webidl b/dom/webidl/HTMLHtmlElement.webidl
index f9174a1852..5b2a9a926d 100644
--- a/dom/webidl/HTMLHtmlElement.webidl
+++ b/dom/webidl/HTMLHtmlElement.webidl
@@ -18,6 +18,6 @@ interface HTMLHtmlElement : HTMLElement {};
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLHtmlElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString version;
 };
diff --git a/dom/webidl/HTMLHyperlinkElementUtils.webidl b/dom/webidl/HTMLHyperlinkElementUtils.webidl
index 25f175db93..ae53fd75e2 100644
--- a/dom/webidl/HTMLHyperlinkElementUtils.webidl
+++ b/dom/webidl/HTMLHyperlinkElementUtils.webidl
@@ -18,17 +18,26 @@ interface HTMLHyperlinkElementUtils {
   // Bug 824857 should remove this.
   stringifier;
 
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute USVString href;
 
   readonly attribute USVString origin;
+  [CEReactions]
            attribute USVString protocol;
+  [CEReactions]
            attribute USVString username;
+  [CEReactions]
            attribute USVString password;
+  [CEReactions]
            attribute USVString host;
+  [CEReactions]
            attribute USVString hostname;
+  [CEReactions]
            attribute USVString port;
+  [CEReactions]
            attribute USVString pathname;
+  [CEReactions]
            attribute USVString search;
+  [CEReactions]
            attribute USVString hash;
 };
diff --git a/dom/webidl/HTMLIFrameElement.webidl b/dom/webidl/HTMLIFrameElement.webidl
index 4b9d1ce4c1..d2859c6dbc 100644
--- a/dom/webidl/HTMLIFrameElement.webidl
+++ b/dom/webidl/HTMLIFrameElement.webidl
@@ -13,21 +13,21 @@
 
 [HTMLConstructor]
 interface HTMLIFrameElement : HTMLElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString src;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString srcdoc;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
   [PutForwards=value] readonly attribute DOMTokenList sandbox;
            // attribute boolean seamless;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean allowFullscreen;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString width;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString height;
-  [SetterThrows, Pure, Pref="network.http.enablePerElementReferrer"]
+  [CEReactions, SetterThrows, Pure, Pref="network.http.enablePerElementReferrer"]
            attribute DOMString referrerPolicy;
   [NeedsSubjectPrincipal]
   readonly attribute Document? contentDocument;
@@ -36,17 +36,19 @@ interface HTMLIFrameElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLIFrameElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString align;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString scrolling;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString frameBorder;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString longDesc;
 
-  [TreatNullAs=EmptyString,SetterThrows,Pure] attribute DOMString marginHeight;
-  [TreatNullAs=EmptyString,SetterThrows,Pure] attribute DOMString marginWidth;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows, Pure]
+           attribute DOMString marginHeight;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows, Pure]
+           attribute DOMString marginWidth;
 };
 
 partial interface HTMLIFrameElement {
diff --git a/dom/webidl/HTMLImageElement.webidl b/dom/webidl/HTMLImageElement.webidl
index c6bc3e4c81..e50a9ef8e3 100644
--- a/dom/webidl/HTMLImageElement.webidl
+++ b/dom/webidl/HTMLImageElement.webidl
@@ -19,23 +19,23 @@ interface nsIStreamListener;
 [HTMLConstructor,
  NamedConstructor=Image(optional unsigned long width, optional unsigned long height)]
 interface HTMLImageElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString alt;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString src;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString srcset;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString? crossOrigin;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString useMap;
-           [SetterThrows, Pref="network.http.enablePerElementReferrer"]
+           [CEReactions, SetterThrows, Pref="network.http.enablePerElementReferrer"]
            attribute DOMString referrerPolicy;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean isMap;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute unsigned long width;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute unsigned long height;
   readonly attribute unsigned long naturalWidth;
   readonly attribute unsigned long naturalHeight;
@@ -44,30 +44,31 @@ interface HTMLImageElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLImageElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString name;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute unsigned long hspace;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute unsigned long vspace;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString longDesc;
 
-  [TreatNullAs=EmptyString,SetterThrows] attribute DOMString border;
+  [CEReactions, TreatNullAs=EmptyString,SetterThrows] attribute DOMString border;
 };
 
 // [Update me: not in whatwg spec yet]
 // http://picture.responsiveimages.org/#the-img-element
 partial interface HTMLImageElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString sizes;
   readonly attribute DOMString currentSrc;
 };
 
 // Mozilla extensions.
 partial interface HTMLImageElement {
+           [CEReactions]
            attribute DOMString lowsrc;
 
   // These attributes are offsets from the closest view (to mimic
diff --git a/dom/webidl/HTMLInputElement.webidl b/dom/webidl/HTMLInputElement.webidl
index deb5b5faf0..93ad90f456 100644
--- a/dom/webidl/HTMLInputElement.webidl
+++ b/dom/webidl/HTMLInputElement.webidl
@@ -23,78 +23,79 @@ interface nsIControllers;
 
 [HTMLConstructor]
 interface HTMLInputElement : HTMLElement {
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString accept;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString alt;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString autocomplete;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean autofocus;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean defaultChecked;
   [Pure]
            attribute boolean checked;
            // Bug 850337 - attribute DOMString dirName;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
   [Pure]
   readonly attribute FileList? files;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString formAction;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString formEnctype;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString formMethod;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean formNoValidate;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString formTarget;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute unsigned long height;
   [Pure]
            attribute boolean indeterminate;
-  [Pure, SetterThrows, Pref="dom.forms.inputmode"]
+  [CEReactions, Pure, SetterThrows, Pref="dom.forms.inputmode"]
            attribute DOMString inputMode;
   [Pure]
   readonly attribute HTMLElement? list;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString max;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute long maxLength;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString min;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute long minLength;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean multiple;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString name;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString pattern;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString placeholder;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean readOnly;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean required;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute unsigned long size;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString src;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString step;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString type;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString defaultValue;
-  [Pure, TreatNullAs=EmptyString, Throws]
+  [CEReactions, Pure, TreatNullAs=EmptyString, Throws]
            attribute DOMString value;
   [Throws, Func="HTMLInputElement::ValueAsDateEnabled"]
            attribute Date? valueAsDate;
   [Pure, SetterThrows]
            attribute unrestricted double valueAsNumber;
+  [CEReactions]
            attribute unsigned long width;
 
   [Throws]
@@ -133,9 +134,9 @@ interface HTMLInputElement : HTMLElement {
 };
 
 partial interface HTMLInputElement {
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString align;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString useMap;
 };
 
diff --git a/dom/webidl/HTMLLIElement.webidl b/dom/webidl/HTMLLIElement.webidl
index d36b96a0f7..3f104d09e0 100644
--- a/dom/webidl/HTMLLIElement.webidl
+++ b/dom/webidl/HTMLLIElement.webidl
@@ -15,12 +15,12 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-li-element
 [HTMLConstructor]
 interface HTMLLIElement : HTMLElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute long value;
 };
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLLIElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString type;
 };
diff --git a/dom/webidl/HTMLLabelElement.webidl b/dom/webidl/HTMLLabelElement.webidl
index 8a5c67fbcf..4b624dfafa 100644
--- a/dom/webidl/HTMLLabelElement.webidl
+++ b/dom/webidl/HTMLLabelElement.webidl
@@ -14,6 +14,7 @@
 [HTMLConstructor]
 interface HTMLLabelElement : HTMLElement {
   readonly attribute HTMLFormElement? form;
+  [CEReactions]
            attribute DOMString htmlFor;
   readonly attribute HTMLElement? control;
 };
diff --git a/dom/webidl/HTMLLegendElement.webidl b/dom/webidl/HTMLLegendElement.webidl
index 8feb70dcbd..6f03ecf1b6 100644
--- a/dom/webidl/HTMLLegendElement.webidl
+++ b/dom/webidl/HTMLLegendElement.webidl
@@ -20,6 +20,6 @@ interface HTMLLegendElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLLegendElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
 };
diff --git a/dom/webidl/HTMLLinkElement.webidl b/dom/webidl/HTMLLinkElement.webidl
index c5d8eec4f3..eb83deab1a 100644
--- a/dom/webidl/HTMLLinkElement.webidl
+++ b/dom/webidl/HTMLLinkElement.webidl
@@ -16,21 +16,21 @@
 interface HTMLLinkElement : HTMLElement {
   [Pure]
            attribute boolean disabled;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString href;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString? crossOrigin;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString rel;
   [PutForwards=value]
   readonly attribute DOMTokenList relList;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString media;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString hreflang;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString type;
-  [SetterThrows, Pure, Pref="network.http.enablePerElementReferrer"]
+  [CEReactions, SetterThrows, Pure, Pref="network.http.enablePerElementReferrer"]
            attribute DOMString referrerPolicy;
   [PutForwards=value] readonly attribute DOMTokenList sizes;
 };
@@ -38,11 +38,11 @@ HTMLLinkElement implements LinkStyle;
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLLinkElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString charset;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString rev;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString target;
 };
 
@@ -54,6 +54,6 @@ partial interface HTMLLinkElement {
 
 // https://w3c.github.io/webappsec/specs/subresourceintegrity/#htmllinkelement-1
 partial interface HTMLLinkElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString integrity;
 };
diff --git a/dom/webidl/HTMLMapElement.webidl b/dom/webidl/HTMLMapElement.webidl
index cf4d404260..199c70876a 100644
--- a/dom/webidl/HTMLMapElement.webidl
+++ b/dom/webidl/HTMLMapElement.webidl
@@ -13,7 +13,7 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-map-element
 [HTMLConstructor]
 interface HTMLMapElement : HTMLElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
   [Constant]
   readonly attribute HTMLCollection areas;
diff --git a/dom/webidl/HTMLMediaElement.webidl b/dom/webidl/HTMLMediaElement.webidl
index be79d8679c..ad31f38cbc 100644
--- a/dom/webidl/HTMLMediaElement.webidl
+++ b/dom/webidl/HTMLMediaElement.webidl
@@ -17,18 +17,18 @@ interface HTMLMediaElement : HTMLElement {
   readonly attribute MediaError? error;
 
   // network state
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute DOMString src;
   readonly attribute DOMString currentSrc;
 
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute DOMString? crossOrigin;
   const unsigned short NETWORK_EMPTY = 0;
   const unsigned short NETWORK_IDLE = 1;
   const unsigned short NETWORK_LOADING = 2;
   const unsigned short NETWORK_NO_SOURCE = 3;
   readonly attribute unsigned short networkState;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute DOMString preload;
   [NewObject]
   readonly attribute TimeRanges buffered;
@@ -63,9 +63,9 @@ interface HTMLMediaElement : HTMLElement {
   [NewObject]
   readonly attribute TimeRanges seekable;
   readonly attribute boolean ended;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute boolean autoplay;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute boolean loop;
   [Throws]
   Promise<void> play();
@@ -78,12 +78,12 @@ interface HTMLMediaElement : HTMLElement {
   //         attribute MediaController? controller;
 
   // controls
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute boolean controls;
   [SetterThrows]
            attribute double volume;
            attribute boolean muted;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute boolean defaultMuted;
 
   // TODO: Bug 847379
diff --git a/dom/webidl/HTMLMenuElement.webidl b/dom/webidl/HTMLMenuElement.webidl
index 7658d83800..1194226c5b 100644
--- a/dom/webidl/HTMLMenuElement.webidl
+++ b/dom/webidl/HTMLMenuElement.webidl
@@ -17,15 +17,15 @@ interface MenuBuilder;
 // http://www.whatwg.org/specs/web-apps/current-work/#the-menu-element
 [HTMLConstructor]
 interface HTMLMenuElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString type;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString label;
 };
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLMenuElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean compact;
 };
 
diff --git a/dom/webidl/HTMLMenuItemElement.webidl b/dom/webidl/HTMLMenuItemElement.webidl
index 1a77504837..f091045017 100644
--- a/dom/webidl/HTMLMenuItemElement.webidl
+++ b/dom/webidl/HTMLMenuItemElement.webidl
@@ -14,22 +14,22 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-menuitem-element
 [HTMLConstructor]
 interface HTMLMenuItemElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString type;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString label;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString icon;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean disabled;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean checked;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString radiogroup;
 
            // This should be 'default' but in the IDL implementation
            // this has been renamed 'defaultChecked'.
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean defaultChecked;
 
            // Currently not implemented.
diff --git a/dom/webidl/HTMLMetaElement.webidl b/dom/webidl/HTMLMetaElement.webidl
index 171f673054..30014a9556 100644
--- a/dom/webidl/HTMLMetaElement.webidl
+++ b/dom/webidl/HTMLMetaElement.webidl
@@ -14,16 +14,16 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-meta-element
 [HTMLConstructor]
 interface HTMLMetaElement : HTMLElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString httpEquiv;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString content;
 };
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLMetaElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString scheme;
 };
diff --git a/dom/webidl/HTMLMeterElement.webidl b/dom/webidl/HTMLMeterElement.webidl
index 484ece85c4..8f93bd71ef 100644
--- a/dom/webidl/HTMLMeterElement.webidl
+++ b/dom/webidl/HTMLMeterElement.webidl
@@ -14,17 +14,17 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-meter-element
 [HTMLConstructor]
 interface HTMLMeterElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double value;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double min;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double max;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double low;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double high;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double optimum;
 
            readonly attribute NodeList labels;
diff --git a/dom/webidl/HTMLModElement.webidl b/dom/webidl/HTMLModElement.webidl
index 654aca2726..8ed8b994b5 100644
--- a/dom/webidl/HTMLModElement.webidl
+++ b/dom/webidl/HTMLModElement.webidl
@@ -13,8 +13,8 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#attributes-common-to-ins-and-del-elements
 [HTMLConstructor]
 interface HTMLModElement : HTMLElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString cite;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString dateTime;
 };
diff --git a/dom/webidl/HTMLOListElement.webidl b/dom/webidl/HTMLOListElement.webidl
index 5b10d48078..93084c227d 100644
--- a/dom/webidl/HTMLOListElement.webidl
+++ b/dom/webidl/HTMLOListElement.webidl
@@ -15,16 +15,16 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-ol-element
 [HTMLConstructor]
 interface HTMLOListElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean reversed;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute long start;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString type;
 };
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLOListElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean compact;
 };
diff --git a/dom/webidl/HTMLObjectElement.webidl b/dom/webidl/HTMLObjectElement.webidl
index 797b041198..7c9f7f8bcf 100644
--- a/dom/webidl/HTMLObjectElement.webidl
+++ b/dom/webidl/HTMLObjectElement.webidl
@@ -15,21 +15,21 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-object-element
 [HTMLConstructor, NeedResolve, UnsafeInPrerendering]
 interface HTMLObjectElement : HTMLElement {
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString data;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString type;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean typeMustMatch;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString name;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString useMap;
   [Pure]
   readonly attribute HTMLFormElement? form;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString width;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString height;
   // Not pure: can trigger about:blank instantiation
   [NeedsSubjectPrincipal]
@@ -51,26 +51,26 @@ interface HTMLObjectElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#HTMLObjectElement-partial
 partial interface HTMLObjectElement {
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString align;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString archive;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString code;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute boolean declare;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute unsigned long hspace;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString standby;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute unsigned long vspace;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString codeBase;
-  [Pure, SetterThrows]
+  [CEReactions, Pure, SetterThrows]
            attribute DOMString codeType;
 
-  [TreatNullAs=EmptyString, Pure, SetterThrows]
+  [CEReactions, TreatNullAs=EmptyString, Pure, SetterThrows]
            attribute DOMString border;
 };
 
diff --git a/dom/webidl/HTMLOptGroupElement.webidl b/dom/webidl/HTMLOptGroupElement.webidl
index 18d2e5dfab..d46fb869d1 100644
--- a/dom/webidl/HTMLOptGroupElement.webidl
+++ b/dom/webidl/HTMLOptGroupElement.webidl
@@ -13,8 +13,8 @@
 
 [HTMLConstructor]
 interface HTMLOptGroupElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean disabled;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString label;
 };
diff --git a/dom/webidl/HTMLOptionElement.webidl b/dom/webidl/HTMLOptionElement.webidl
index 34e6e6c23e..b94afa3e92 100644
--- a/dom/webidl/HTMLOptionElement.webidl
+++ b/dom/webidl/HTMLOptionElement.webidl
@@ -13,19 +13,19 @@
 
 [HTMLConstructor, NamedConstructor=Option(optional DOMString text, optional DOMString value, optional boolean defaultSelected, optional boolean selected)]
 interface HTMLOptionElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString label;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean defaultSelected;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean selected;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString value;
 
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString text;
   readonly attribute long index;
 };
diff --git a/dom/webidl/HTMLOptionsCollection.webidl b/dom/webidl/HTMLOptionsCollection.webidl
index 4d4385d820..d8d1046adf 100644
--- a/dom/webidl/HTMLOptionsCollection.webidl
+++ b/dom/webidl/HTMLOptionsCollection.webidl
@@ -11,13 +11,14 @@
  */
 
 interface HTMLOptionsCollection : HTMLCollection {
+  [CEReactions]
            attribute unsigned long length;
-  [Throws]
+  [CEReactions, Throws]
   setter creator void (unsigned long index, HTMLOptionElement? option);
-  [Throws]
+  [CEReactions, Throws]
   void add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
-  [Throws]
+  [CEReactions, Throws]
   void remove(long index);
-  [Throws]
+  [CEReactions, Throws]
            attribute long selectedIndex;
 };
diff --git a/dom/webidl/HTMLOutputElement.webidl b/dom/webidl/HTMLOutputElement.webidl
index 698fd08d1b..4d65209a93 100644
--- a/dom/webidl/HTMLOutputElement.webidl
+++ b/dom/webidl/HTMLOutputElement.webidl
@@ -17,14 +17,14 @@ interface HTMLOutputElement : HTMLElement {
   [PutForwards=value, Constant]
   readonly attribute DOMTokenList htmlFor;
   readonly attribute HTMLFormElement? form;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
 
   [Constant]
   readonly attribute DOMString type;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString defaultValue;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString value;
 
   readonly attribute boolean willValidate;
diff --git a/dom/webidl/HTMLParagraphElement.webidl b/dom/webidl/HTMLParagraphElement.webidl
index b72f627d13..289af4c9fd 100644
--- a/dom/webidl/HTMLParagraphElement.webidl
+++ b/dom/webidl/HTMLParagraphElement.webidl
@@ -18,6 +18,6 @@ interface HTMLParagraphElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLParagraphElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
 };
diff --git a/dom/webidl/HTMLParamElement.webidl b/dom/webidl/HTMLParamElement.webidl
index b9f17d6f53..cf6b5a35a7 100644
--- a/dom/webidl/HTMLParamElement.webidl
+++ b/dom/webidl/HTMLParamElement.webidl
@@ -15,16 +15,16 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-param-element
 [HTMLConstructor]
 interface HTMLParamElement : HTMLElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString value;
 };
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLParamElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString type;
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString valueType;
 };
diff --git a/dom/webidl/HTMLPreElement.webidl b/dom/webidl/HTMLPreElement.webidl
index b128e824d3..6929cd533a 100644
--- a/dom/webidl/HTMLPreElement.webidl
+++ b/dom/webidl/HTMLPreElement.webidl
@@ -18,6 +18,6 @@ interface HTMLPreElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLPreElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute long width;
 };
diff --git a/dom/webidl/HTMLProgressElement.webidl b/dom/webidl/HTMLProgressElement.webidl
index 5729829cdc..564b9f2a4f 100644
--- a/dom/webidl/HTMLProgressElement.webidl
+++ b/dom/webidl/HTMLProgressElement.webidl
@@ -13,9 +13,9 @@
 
 [HTMLConstructor]
 interface HTMLProgressElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double value;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute double max;
   readonly attribute double position;
   readonly attribute NodeList labels;
diff --git a/dom/webidl/HTMLQuoteElement.webidl b/dom/webidl/HTMLQuoteElement.webidl
index 5cf9c4c29e..c999b14786 100644
--- a/dom/webidl/HTMLQuoteElement.webidl
+++ b/dom/webidl/HTMLQuoteElement.webidl
@@ -14,7 +14,7 @@
 // http://www.whatwg.org/specs/web-apps/current-work/#the-blockquote-element
 [HTMLConstructor]
 interface HTMLQuoteElement : HTMLElement {
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString cite;
 };
 
diff --git a/dom/webidl/HTMLScriptElement.webidl b/dom/webidl/HTMLScriptElement.webidl
index 8bcffe8d74..286c0673d8 100644
--- a/dom/webidl/HTMLScriptElement.webidl
+++ b/dom/webidl/HTMLScriptElement.webidl
@@ -10,34 +10,34 @@
 
 [HTMLConstructor]
 interface HTMLScriptElement : HTMLElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString src;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString type;
-  [SetterThrows, Pref="dom.moduleScripts.enabled"]
+  [CEReactions, SetterThrows, Pref="dom.moduleScripts.enabled"]
   attribute boolean noModule;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString charset;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute boolean async;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute boolean defer;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString? crossOrigin;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString text;
 };
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLScriptElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString event;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString htmlFor;
 };
 
 // https://w3c.github.io/webappsec/specs/subresourceintegrity/#htmlscriptelement-1
 partial interface HTMLScriptElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
   attribute DOMString integrity;
 };
diff --git a/dom/webidl/HTMLSelectElement.webidl b/dom/webidl/HTMLSelectElement.webidl
index 9a9b330409..537e9d84f7 100644
--- a/dom/webidl/HTMLSelectElement.webidl
+++ b/dom/webidl/HTMLSelectElement.webidl
@@ -9,21 +9,21 @@
 
 [HTMLConstructor]
 interface HTMLSelectElement : HTMLElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean autofocus;
-  [Pref="dom.forms.autocomplete.experimental", SetterThrows, Pure]
+  [CEReactions, Pref="dom.forms.autocomplete.experimental", SetterThrows, Pure]
            attribute DOMString autocomplete;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean disabled;
   [Pure]
   readonly attribute HTMLFormElement? form;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean multiple;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean required;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute unsigned long size;
 
   [Pure]
@@ -31,14 +31,15 @@ interface HTMLSelectElement : HTMLElement {
 
   [Constant]
   readonly attribute HTMLOptionsCollection options;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute unsigned long length;
   getter Element? item(unsigned long index);
   HTMLOptionElement? namedItem(DOMString name);
-  [Throws]
+  [CEReactions, Throws]
   void add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+  [CEReactions]
   void remove(long index);
-  [Throws]
+  [CEReactions, Throws]
   setter creator void (unsigned long index, HTMLOptionElement? option);
 
   readonly attribute HTMLCollection selectedOptions;
@@ -57,6 +58,7 @@ interface HTMLSelectElement : HTMLElement {
   readonly attribute NodeList labels;
 
   // https://www.w3.org/Bugs/Public/show_bug.cgi?id=20720
+  [CEReactions]
   void remove();
 };
 
diff --git a/dom/webidl/HTMLSourceElement.webidl b/dom/webidl/HTMLSourceElement.webidl
index 402b4491a9..55f25e469c 100644
--- a/dom/webidl/HTMLSourceElement.webidl
+++ b/dom/webidl/HTMLSourceElement.webidl
@@ -13,17 +13,17 @@
 
 [HTMLConstructor]
 interface HTMLSourceElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString src;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString type;
 };
 
 partial interface HTMLSourceElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString srcset;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString sizes;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString media;
 };
diff --git a/dom/webidl/HTMLStyleElement.webidl b/dom/webidl/HTMLStyleElement.webidl
index b547d69766..3cacbf62fd 100644
--- a/dom/webidl/HTMLStyleElement.webidl
+++ b/dom/webidl/HTMLStyleElement.webidl
@@ -12,9 +12,9 @@
 interface HTMLStyleElement : HTMLElement {
            [Pure]
            attribute boolean disabled;
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString media;
-           [SetterThrows, Pure]
+           [CEReactions, SetterThrows, Pure]
            attribute DOMString type;
            [SetterThrows, Pure]
            attribute boolean scoped;
diff --git a/dom/webidl/HTMLTableCaptionElement.webidl b/dom/webidl/HTMLTableCaptionElement.webidl
index e9d01527e7..48c9d354a6 100644
--- a/dom/webidl/HTMLTableCaptionElement.webidl
+++ b/dom/webidl/HTMLTableCaptionElement.webidl
@@ -15,6 +15,6 @@
 interface HTMLTableCaptionElement : HTMLElement {};
 
 partial interface HTMLTableCaptionElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
 };
diff --git a/dom/webidl/HTMLTableCellElement.webidl b/dom/webidl/HTMLTableCellElement.webidl
index f0a251d273..aff94914f1 100644
--- a/dom/webidl/HTMLTableCellElement.webidl
+++ b/dom/webidl/HTMLTableCellElement.webidl
@@ -13,40 +13,41 @@
 
 [HTMLConstructor]
 interface HTMLTableCellElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute unsigned long colSpan;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute unsigned long rowSpan;
   //[PutForwards=value] readonly attribute DOMTokenList headers;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString headers;
   readonly attribute long cellIndex;
 
   // Mozilla-specific extensions
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString abbr;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString scope;
 };
 
 partial interface HTMLTableCellElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString axis;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString height;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString width;
 
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString ch;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString chOff;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean noWrap;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString vAlign;
 
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString bgColor;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString bgColor;
 };
diff --git a/dom/webidl/HTMLTableColElement.webidl b/dom/webidl/HTMLTableColElement.webidl
index cf217548ae..02be4590a1 100644
--- a/dom/webidl/HTMLTableColElement.webidl
+++ b/dom/webidl/HTMLTableColElement.webidl
@@ -13,19 +13,19 @@
 
 [HTMLConstructor]
 interface HTMLTableColElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute unsigned long span;
 };
 
 partial interface HTMLTableColElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString ch;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString chOff;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString vAlign;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString width;
 };
diff --git a/dom/webidl/HTMLTableElement.webidl b/dom/webidl/HTMLTableElement.webidl
index 2653524d64..f81e000418 100644
--- a/dom/webidl/HTMLTableElement.webidl
+++ b/dom/webidl/HTMLTableElement.webidl
@@ -13,44 +13,50 @@
 
 [HTMLConstructor]
 interface HTMLTableElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute HTMLTableCaptionElement? caption;
   HTMLElement createCaption();
+  [CEReactions]
   void deleteCaption();
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute HTMLTableSectionElement? tHead;
   HTMLElement createTHead();
+  [CEReactions]
   void deleteTHead();
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute HTMLTableSectionElement? tFoot;
   HTMLElement createTFoot();
+  [CEReactions]
   void deleteTFoot();
   readonly attribute HTMLCollection tBodies;
   HTMLElement createTBody();
   readonly attribute HTMLCollection rows;
   [Throws]
   HTMLElement insertRow(optional long index = -1);
-  [Throws]
+  [CEReactions, Throws]
   void deleteRow(long index);
   //         attribute boolean sortable;
   //void stopSorting();
 };
 
 partial interface HTMLTableElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString border;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString frame;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString rules;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString summary;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString width;
 
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString bgColor;
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString cellPadding;
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString cellSpacing;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString bgColor;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString cellPadding;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString cellSpacing;
 };
diff --git a/dom/webidl/HTMLTableRowElement.webidl b/dom/webidl/HTMLTableRowElement.webidl
index 7d63bcc049..153d271f1f 100644
--- a/dom/webidl/HTMLTableRowElement.webidl
+++ b/dom/webidl/HTMLTableRowElement.webidl
@@ -16,21 +16,22 @@ interface HTMLTableRowElement : HTMLElement {
   readonly attribute long rowIndex;
   readonly attribute long sectionRowIndex;
   readonly attribute HTMLCollection cells;
-  [Throws]
+  [CEReactions, Throws]
   HTMLElement insertCell(optional long index = -1);
   [Throws]
   void deleteCell(long index);
 };
 
 partial interface HTMLTableRowElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString ch;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString chOff;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString vAlign;
 
-  [TreatNullAs=EmptyString, SetterThrows] attribute DOMString bgColor;
+  [CEReactions, TreatNullAs=EmptyString, SetterThrows]
+           attribute DOMString bgColor;
 };
diff --git a/dom/webidl/HTMLTableSectionElement.webidl b/dom/webidl/HTMLTableSectionElement.webidl
index 881972ac21..a71682fc15 100644
--- a/dom/webidl/HTMLTableSectionElement.webidl
+++ b/dom/webidl/HTMLTableSectionElement.webidl
@@ -16,17 +16,17 @@ interface HTMLTableSectionElement : HTMLElement {
   readonly attribute HTMLCollection rows;
   [Throws]
   HTMLElement insertRow(optional long index = -1);
-  [Throws]
+  [CEReactions, Throws]
   void deleteRow(long index);
 };
 
 partial interface HTMLTableSectionElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString align;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString ch;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString chOff;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString vAlign;
 };
diff --git a/dom/webidl/HTMLTextAreaElement.webidl b/dom/webidl/HTMLTextAreaElement.webidl
index 8c5dc0fb9b..7a181bf394 100644
--- a/dom/webidl/HTMLTextAreaElement.webidl
+++ b/dom/webidl/HTMLTextAreaElement.webidl
@@ -17,38 +17,38 @@ interface MozControllers;
 [HTMLConstructor]
 interface HTMLTextAreaElement : HTMLElement {
            // attribute DOMString autocomplete;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean autofocus;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute unsigned long cols;
            // attribute DOMString dirName;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean disabled;
   [Pure]
   readonly attribute HTMLFormElement? form;
            // attribute DOMString inputMode;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute long maxLength;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute long minLength;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString name;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString placeholder;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean readOnly;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute boolean required;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute unsigned long rows;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString wrap;
 
   [Constant]
   readonly attribute DOMString type;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
            attribute DOMString defaultValue;
-  [TreatNullAs=EmptyString] attribute DOMString value;
+  [CEReactions, TreatNullAs=EmptyString] attribute DOMString value;
   readonly attribute unsigned long textLength;
 
   readonly attribute boolean willValidate;
diff --git a/dom/webidl/HTMLTimeElement.webidl b/dom/webidl/HTMLTimeElement.webidl
index ea37405bfc..35c06fef31 100644
--- a/dom/webidl/HTMLTimeElement.webidl
+++ b/dom/webidl/HTMLTimeElement.webidl
@@ -9,6 +9,6 @@
 
 [HTMLConstructor]
 interface HTMLTimeElement : HTMLElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString dateTime;
 };
diff --git a/dom/webidl/HTMLTitleElement.webidl b/dom/webidl/HTMLTitleElement.webidl
index c8fe3e46a5..bbce70bb2a 100644
--- a/dom/webidl/HTMLTitleElement.webidl
+++ b/dom/webidl/HTMLTitleElement.webidl
@@ -9,6 +9,6 @@
 
 [HTMLConstructor]
 interface HTMLTitleElement : HTMLElement {
-           [Throws]
+           [CEReactions, Throws]
            attribute DOMString text;
 };
diff --git a/dom/webidl/HTMLTrackElement.webidl b/dom/webidl/HTMLTrackElement.webidl
index e6d366f10d..cbb70db2a3 100644
--- a/dom/webidl/HTMLTrackElement.webidl
+++ b/dom/webidl/HTMLTrackElement.webidl
@@ -9,15 +9,15 @@
 
 [HTMLConstructor]
 interface HTMLTrackElement : HTMLElement {
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
   attribute DOMString kind;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
   attribute DOMString src;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
   attribute DOMString srclang;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
   attribute DOMString label;
-  [SetterThrows, Pure]
+  [CEReactions, SetterThrows, Pure]
   attribute boolean default;
 
   const unsigned short NONE = 0;
diff --git a/dom/webidl/HTMLUListElement.webidl b/dom/webidl/HTMLUListElement.webidl
index 01ca7afce4..725437494a 100644
--- a/dom/webidl/HTMLUListElement.webidl
+++ b/dom/webidl/HTMLUListElement.webidl
@@ -19,8 +19,8 @@ interface HTMLUListElement : HTMLElement {
 
 // http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
 partial interface HTMLUListElement {
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute boolean compact;
-           [SetterThrows]
+           [CEReactions, SetterThrows]
            attribute DOMString type;
 };
diff --git a/dom/webidl/HTMLVideoElement.webidl b/dom/webidl/HTMLVideoElement.webidl
index fd552f7e0d..5ae4c016f1 100644
--- a/dom/webidl/HTMLVideoElement.webidl
+++ b/dom/webidl/HTMLVideoElement.webidl
@@ -13,13 +13,13 @@
 
 [HTMLConstructor]
 interface HTMLVideoElement : HTMLMediaElement {
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute unsigned long width;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute unsigned long height;
   readonly attribute unsigned long videoWidth;
   readonly attribute unsigned long videoHeight;
-  [SetterThrows]
+  [CEReactions, SetterThrows]
            attribute DOMString poster;
 };