As some old versions of IE didn’t provide the event as argument to event listeners, we got used to (event||window.event).
In order to decide whether it can still make some sense to have this in a modern library, I tried to look at what versions were concerned but I couldn’t find this information.
So, what’s the most recent version of IE that didn’t provide the event as argument ?
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Answer
Internet Explorer provides a global object window.event, which references the last event. And before IE9 there are no arguments in the handler.