code: function applyStyle(f) {
  
      // remember original style, we need this to restore the fitty style when unsubscribing
      if (!f.originalStyle) {
        f.originalStyle = f.element.getAttribute('style') || '';
      }
  
      // set the new style to the original style plus the fitty styles
      f.element.style.cssText = f.originalStyle + ';white-space:' + f.whiteSpace + ';display:' + f.display + ';font-size:' + f.currentFontSize + 'px';
    }
docs: apply styles to single fitty