2.3.2 [WEBSTG] Section 4.4.1, Event definition

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E0002:

The specification includes the following Event definition:

 IDL[Constructor(DOMString type, optional StorageEventInit eventInitDict)]
 interface StorageEvent : Event {
   readonly attribute DOMString key;
   readonly attribute DOMString? oldValue;
   readonly attribute DOMString? newValue;
   readonly attribute DOMString url;
   readonly attribute Storage? storageArea;
 };
  
 dictionary StorageEventInit : EventInit {
   DOMString key;
   DOMString? oldValue;
   DOMString? newValue;
   DOMString url;
   Storage? storageArea;
 };

IE8 Mode, IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

Event constructors from [DOMCORE] are not supported. Instead, the initStorageEvent method is supported.