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DOM : Selectable list

<!DOCTYPE HTML>
<html>

<head>
  <meta charset="utf-8">
  <style>
    .selected {
      background: #0f0;
    }

    li {
      cursor: pointer;
    }
  </style>
</head>

<body>

  Click on a list item to select it.
  <br>

  <ul id="ul">
    <li>Christopher Robin</li>
    <li>Winnie-the-Pooh</li>
    <li>Tigger</li>
    <li>Kanga</li>
    <li>Rabbit. Just rabbit.</li>
  </ul>

  <script>
    ul.onclick = function(event) {
      if(event.target.tagName != "LI") return;
      //only going to be applied on lis
     
      if (event.ctrlKey || event.metaKey) {
        toggleSelect(event.target);
      } else {
        singleSelect(event.target);
      }
    }
   
    ul.onmousedown = function() {
      return false;
    };//disables default mouse action like being selected
    //as the task asked, PREVENT THE NATIVE BROWSER SELECTION
   
    function toggleSelect(li){
      li.classList.toggle('selected');
    }//this one doesnt do much
   
    function singleSelect(li) {
      let selected = ul.querySelectorAll('.selected');
      for(let elem of selected) {
        elem.classList.remove('selected');
      }//cancel the selection on ul i guess?
      //it ALSO CANCELED PRE GROUP SELECTED LIS
      //INICIATE THE FIELD
      li.classList.add('selected');
      //and limits the selected state only for li
    }
   
  </script>

</body>
</html>
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