That's not a JS inconsistency, that's just the browser calling yourhandler.call(yourobject, eventobject).
The underlying statement is that "event handler" is not a concept in JS, it's just a way of calling functions that some implementations use for some things (browsers for actions, node for I/O, etc...).
In fact, this didn't use to be true of old IE versions if I remember correctly, so it's not a matter of the language, but of what the browser does with your function during event firings.
You can get the current emitting object via e.currentTarget. Modifying 'this', while cute, just makes yet another thing that must be explained to people when you start talking about 'this'.
The underlying statement is that "event handler" is not a concept in JS, it's just a way of calling functions that some implementations use for some things (browsers for actions, node for I/O, etc...).
In fact, this didn't use to be true of old IE versions if I remember correctly, so it's not a matter of the language, but of what the browser does with your function during event firings.