[Bug 26101] New: say what to do with event initializer dictionaries that have members without a default value

https://www.w3.org/Bugs/Public/show_bug.cgi?id=26101

            Bug ID: 26101
           Summary: say what to do with event initializer dictionaries
                    that have members without a default value
           Product: WebAppsWG
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

If we have this:

  dictionary SomeEventInit : EventInit {
    sequence<DOMString> values;
  };

  [Constructor(optional SomeEventInit eventInitDict)]
  interface SomeEvent : Event {
    [Cached] readonly attribute sequence<DOMString> values;
  };

assuming that [Cached] is a thing, then
http://dom.spec.whatwg.org/#concept-event-constructor doesn't handle what to do
when the values dictionary member is not present, for example if you do:

  new SomeEvent({});

Maybe the http://dom.spec.whatwg.org/#concept-event-constructor algorithm allow
prose in other specs to describe how the Event object members get their values
in this case?

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