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Currently the spec has callback OnErrorEventHandlerNonNull = any ((Event or DOMString) event, DOMString source, unsigned long lineno, unsigned long column); But in practice the latter 3 params are used only for script errors.
See also http://lists.w3.org/Archives/Public/public-script-coord/2012OctDec/0117.html
Can you elaborate? Wouldn't the last three be undefined if the callback was invoked with just one argument? Or is this just editorial?
Ian, the callback cannot be invoked with just one argument per WebIDL given how the IDL is written for it right now, as far as I can see. It must be invoked with 4 arguments.
r7678