How To Close A Document In Google Drive Without Saving

So I opened a Google Document from my Google Drive.

First of all, maybe I’m blind, but I cannot see how to close the document, aside from just closing the Tab.

Given that it automatically autosaves constantly, what if I made a bunch of changes, but decide I just want to close it without changes?

I realize I could just keep hitting Ctrl Z to get back where I was, but c’mon, where is the close button, followed by a Save Changes dialog box?

Thanks smarter people than me!