var isOpera = navigator.userAgent.indexOf("Opera") > -1;
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       case 38: //up arrow
       case 40: //down arrow
       case 37: //left arrow
       case 39: //right arrow
       case 33: //page up
       case 34: //page down
       case 36: //home
       case 35: //end
       case 13: //enter
       case 9: //tab
       case 27: //esc
       case 16: //shift
       case 17: //ctrl
       case 18: //alt
       case 20: //caps lock
       case 8: //backspace
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