diff --git a/dom/interfaces.html b/dom/interfaces.html
index 21c35c238e3e15..f777986bf16ff4 100644
--- a/dom/interfaces.html
+++ b/dom/interfaces.html
@@ -542,14 +542,13 @@
DOM IDL tests
readonly attribute unsigned long length;
getter DOMString? item(unsigned long index);
boolean contains(DOMString token);
- void add(DOMString... tokens);
- void remove(DOMString... tokens);
- boolean toggle(DOMString token, optional boolean force);
- void replace(DOMString token, DOMString newToken);
+ [CEReactions] void add(DOMString... tokens);
+ [CEReactions] void remove(DOMString... tokens);
+ [CEReactions] boolean toggle(DOMString token, optional boolean force);
+ [CEReactions] void replace(DOMString token, DOMString newToken);
boolean supports(DOMString token);
- attribute DOMString value;
- stringifier;
-// iterable;
+ [CEReactions] stringifier attribute DOMString value;
+ // iterable;
};