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-rw-r--r--components/script/dom/webidls/ExtendableEvent.webidl2
1 files changed, 1 insertions, 1 deletions
diff --git a/components/script/dom/webidls/ExtendableEvent.webidl b/components/script/dom/webidls/ExtendableEvent.webidl
index 7dc2983fe74..5d6c4786c3f 100644
--- a/components/script/dom/webidls/ExtendableEvent.webidl
+++ b/components/script/dom/webidls/ExtendableEvent.webidl
@@ -5,7 +5,7 @@
// https://w3c.github.io/ServiceWorker/#extendable-event
[Constructor(DOMString type,
- optional ExtendableEventInit eventInitDict),
+ optional ExtendableEventInit eventInitDict = {}),
Exposed=ServiceWorker,
Pref="dom.serviceworker.enabled"]
interface ExtendableEvent : Event {