[Bug 23186] New: EventListener argument of addEventListener and removeEventListener should not be nullable

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23186

            Bug ID: 23186
           Summary: EventListener argument of addEventListener and
                    removeEventListener should not be nullable
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM3 Events
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

The definition table of arguments of addEventListener and removeEventListenr
defines the EventListener as nullable ("✔").

However, the explanation documents: The listener parameter MUST be an object
that implements the EventListener interface or a function.

Additionally, I have no idea the purpose of the argument nullable.

So, I think that they should be "✘".

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