anchor.diff:      if (event.keyCode === 9 || (event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40)) {
         event.preventDefault();
       }
  -  })
  +  });
   
     // trigger impress action (next or prev) on keyup
     document.on.keyUp.add((event) {
  
positive.code: }
  
  main() {
    // throttling function calls
    var throttle = (fn, delay) {
      int timer = 0;
      return () => {
        fn(context, args);
      }
    };
  
    document.on.change.add((event) {
      var api = event.detail.api;
    });
  
negative.code: #import('dart:html');
  
  /**
   * Throttling function calls
   */
  throttle(fn, int delay) {
    int handle = 0;
    return (args) {
  