code: function _unselectWord(wordElement) {
          if (wordElement != null)
              wordElement.className = wordElement.className.split(' ').filter(obj => !/ac__word--selected/.test(obj)).join(' ');
      }
docs: Remove the 'ac__word--selected' class from the desired element. Used when navigating through the ui widget.
  
  @param {DOM Node} wordElement - The DOM Node containing the word that must be unselected (meaning it lost focus)