But note that keyboard things operate on key down. Software operating on key up has caused me surprisingly much grief. I can think of two systems I interact with, off the top of my head, that trigger things on Escape key up, which is badly wrong in that I often do Alt down → Tab press → no wait, I do want to be here → Escape press → Alt up, and so the browser which didn’t see the Escape down (because it didn’t belong to it) does see the Escape up, and improperly cancels what I was in the middle of or similar. This is so annoying.