Re: Passing JavaScript Function object to EventTarget.addEventListener()

On Dec 1, 1:16 pm, Sergey Yanovich wrote:
> [1] specifies that the second argument taken by
> addEventListener to be an EventListener instance. However,
> Mozilla accepts plain Function objects just fine.

From "ECMAScript Language Binding" (DOM Level 2 events):-

| Object EventListener
|    This is an ECMAScript function reference. This method has
|    no return value. The parameter is a Event object.

<URL: http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/ecma-script-binding.html
>

- so for ECMAScript the DOM level 2 events - EventListener - interface
is a ("plain") function object.

> Could anyone provide any pointers why this works (is this a DOM
> feature or an extension),

The behaviour is as specified (and expecting a Java-style -
EventListener - to be effective in cross-browser client-side code is
unrealistic, that would be an 'extension').

> and in which module this is implemented (dom, content,
> or xpconnect maybe)?

I have no idea.