JS Snippet to toggle furigana in anki

furigana.html

<div class="reading front">
  <a href="http://jisho.org/search/{{text:kanji:Reading}}">
     <span id="expression-content">{{kanji:Reading}}</span>
    <span class="hidden" id="reading-content">{{furigana:Reading}}</span>
  </a>
</div>
<div class="dim">{{Notes}}</div>

<script>
 function linkHit (e) { 
      e.preventDefault();
      e.stopPropagation();
      reading.classList.remove('hidden');
      expression.classList.add('hidden');
  }
  //CHANGE ID HERE IF YOU WANT TO CALL YOUR'S SOMETHING ELSE
  var reading    = document.getElementById("reading-content");
  var expression = document.getElementById('expression-content');
  var clicked = false;
  expression.addEventListener('click', function(e){
     if (reading.innerText !== expression.innerText && !clicked) {
       clicked = true;
       linkHit(e);
     }
  });
document.addEventListener('keydown', function(e) {
//CHANGE KEYCODE TO TOGGLE FURIGANA
  if(e.keyCode === 96){
	linkHit(e);
  }
}); 
</script>

styles.css

.hidden{
  display: none;
}