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Is it possible to check the status of Scroll Lock, Num Lock and Caps Lock on page load of a web page? I've found ways to check after a keypress using JavaScript, but that's not what I'm asking.
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IN 2019, this is now possible:
Source: https://www.w3schools.com/jsref/event_mouse_getmodifierstate.asp
No, you can't get system state from javascript. You will need them to type something and then analyze the input. Probably not what you wanted to hear =/