What did I accidentally press to close my Chrome browser?

I slipped and hit something in the shift, ctrl, z,x, alt region while typing.

?2021-03-15T01:56:19Z

Ctrl + W or Alt + F4

Master Of Puppets2021-03-14T20:15:50Z

If you only had 1 tab open and pressed "Ctrl-W", that would have closed the tab and closed your browser. Alt-F4 would also close the entire browser.