[vedosity]

The page seems to assume that semicolon's keyCode is 59 so the modifier key in the demo only works with Firefox according to this table on MDN[0]. The keyCode for semicolon varies not only by keyboard layout but also by browser. Mine is 186.

[0]: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEve...

[ianthehenry]

Hey, thanks! TIL. Indeed, I only tested Firefox.