Check if a key is down?

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In addition to using keyup and keydown listeners to track when is key goes down and back up, there are actually some properties that tell you if certain keys are down.

window.onmousemove = function (e) {
  if (!e) e = window.event;
  if (e.shiftKey) {/*shift is down*/}
  if (e.altKey) {/*alt is down*/}
  if (e.ctrlKey) {/*ctrl is down*/}
  if (e.metaKey) {/*cmd is down*/}
}

This are available on all browser generated event objects, such as those from keydown, keyup, and keypress, so you don’t have to use mousemove.

I tried generating my own event objects with document.createEvent('KeyboardEvent') and document.createEvent('KeyboardEvent') and looking for e.shiftKey and such, but I had no luck.

I’m using Chrome 17 on Mac

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