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-rw-r--r--components/script/dom/webidls/MutationObserver.webidl3
1 files changed, 2 insertions, 1 deletions
diff --git a/components/script/dom/webidls/MutationObserver.webidl b/components/script/dom/webidls/MutationObserver.webidl
index a2f223da800..0ed66457dea 100644
--- a/components/script/dom/webidls/MutationObserver.webidl
+++ b/components/script/dom/webidls/MutationObserver.webidl
@@ -7,8 +7,9 @@
*/
// https://dom.spec.whatwg.org/#mutationobserver
-[Pref="dom.mutation_observer.enabled", Constructor(MutationCallback callback)]
+[Pref="dom.mutation_observer.enabled"]
interface MutationObserver {
+ [Throws] constructor(MutationCallback callback);
[Throws]
void observe(Node target, optional MutationObserverInit options = {});
void disconnect();