2.1.75 [W3C-HTML51] Section 4.11.5.3 The RelatedEvent interfaces

V0404: The RelatedEvent interface is not supported

The specification states:

 4.11.5.3. The RelatedEvent interfaces
  
     [Constructor(DOMString type, optional RelatedEventInit eventInitDict)]
     interface RelatedEvent : Event {
         readonly attribute EventTarget? relatedTarget;
     };

EdgeHTML Mode

The RelatedEvent interface is not supported.