JavaScript : Copy text to the clipboard, without Flash and securely with subsequent url-change

copy-and-paste-refer-to-new-location.js

//www.lsauer.com, lo sauer 2013
//see: http://www.lsauer.com/2012/05/javascript-copy-text-to-clipboard.html
var keypressHandlerForwardLocation = function(evt){
    if(evt instanceof KeyboardEvent && evt.target instanceof HTMLElement 
       && evt.keyCode == 99 && evt.ctrlKey==true && evt.target != null 
       && (evt.target.innerText || evt.target.value).Trim().substr(0,4) == "http"){ 
      cancelBubble = true;
      window.location = (evt.target.innerText || evt.target.value).Trim();
    }
}

//attach
keypressHandlerForwardLocation.attached 
|| ((keypressHandlerForwardLocation.attached = true) && window.addEventListener("keypress", keypressHandlerForwardLocation))