code: function pfx(prop) {
  
              if (thePrefix[prop]){
                  return thePrefix[prop];
              }
  
              var arrayOfPrefixes = ['Webkit', 'Moz', 'Ms', 'O']
                  ,name
                  ;
  
              for (var i = 0, l = arrayOfPrefixes.length; i < l; ++i) {
  
                  name = arrayOfPrefixes[i] + toTitleCase(prop);
  
                  if (name in tmpdiv.style){
                      return thePrefix[prop] = name;
                  }
              }
  
              if (name in tmpdiv.style){
                  return thePrefix[prop] = prop;
              }
  
              return false;
          }
docs: utility methods