It doesn’t inherit from Element
because not all event targets are elements.
Element, document, and window are the most common event targets, but other objects can be event targets too, for example XMLHttpRequest, AudioNode, AudioContext, and others.
Even the KeyboardEvent
you’re trying to use can occur on a DOM element or on the window object (and theoretically on other things), so right there it wouldn’t make sense for evt.target
to be defined as an Element
.
If it is an event on a DOM element, then I would say that you can safely assume evt.target
. is an Element
. I don’t think this is an matter of cross-browser behavior. Merely that EventTarget
is a more abstract interface than Element
.
Further reading: https://github.com/Microsoft/TypeScript/issues/29540