keydown (repetition) breaks when keyup event (for ANOTHER key) is fired

Question

This is a bit of a weird one so I figure I\'m either missing something obvious or this is a flaw with how these events are implemented in browsers.

Let me first summ

Answer 1

Here is my system for my keyboard input. You can see how the repeating key can be extracted for your own use here. It will allow you to notice held keys and not rely on an Operating system as another answer incorrectly assumed.

var down = [140]; //make an array to cover all the keypresses you should need with a normal keyboard

document.addEventListener('keydown', function(event) {
  if (down[event.keyCode]){
    return;
  } else {
   //do the normal things you do when you get key presses
  down[event.keyCode]=true;
  }
}, true);
document.addEventListener('keyup', function(event) {
  down[event.keyCode]=false;
   //do the normal things you do when you get key releases
}, true);

You can just check for the array "down" and the position within it of whatever keycode you want. I use it to prevent keyrepeats for game input. Hope this helps!