title: Why does Javascript drop keyUp events when the metaKey is pressed on Mac browsers?
body: <p>On Mac browsers, javascript does not receive keyup events for most keys (other modifier keys seem to be an exception) when the metakey is down. Use this jsfiddle to demonstrate (focus the result area and try something like cmd + x, the x will not receive a keyup event):
  <a href="http://jsfiddle.net/mUEaV/">http://jsfiddle.net/mUEaV/</a></p>
  
  <p>I've reproduced this in stable releases for Chrome, FF, Safari and Opera. The same thing does not seem to happen with the control key in Windows 7.</p>
  
  <p>Is the OS hijacking the keyup event? This seems especially strange since commands that use the metakey such as save, find, cut, copy, etcetera all activate on keydown not on keyup, and can be hijacked by the javascript just fine.</p>