I want do some javascript validation. I am using keyup and I've been going nicely with

isFinite(event.key)

I just noticed I'm not catching delete/backspace though so I thought I'd add a check. Everywhere I look it says don't use the deprecated 'event.keyCode' (8 & 46) any more but the only easy alternative I can see is use

event.key ==="BackSpace" || event.key ==="Delete"

I just wondered if this is standard in just English speaking 'countries' (settings...), just for the same (european ?) alphabet or fairly international ?