zdoc/layouts/shortcodes/codes.html

{{ $id := substr (md5 .Inner) 0 16 }}
<div id="{{ $id }}" class="codetab">
  <div class="codetab__links">
    {{ range .Params }}
      <button class="codetab__link" aria-label="Tab link">{{ . }}</button>
    {{ end }}
  </div>
  {{ .Inner }}
</div>

<script>
  'use strict';

  var containerId = JSON.parse({{ $id | jsonify }});
  var containerElem = document.getElementById(containerId);
  var codetabLinks = null;
  var codetabContents = null;
  var ids = [];

  if (containerElem) {
    codetabLinks = containerElem.querySelectorAll('.codetab__link');
    codetabContents = containerElem.querySelectorAll('.codetab__content');
  }

  for (var i = 0; i < codetabContents.length; i++) {
    ids = ids.concat(codetabContents[i].getAttribute('id'));
    codetabContents[i].style.display = 'none';

    if (0 === parseInt(i, 10) && !codetabContents[i].classList.contains('active')) {
      codetabContents[i].classList.add('active');
    }
  }

  for (var i = 0; i < codetabLinks.length; i++) {
    codetabLinks[i].setAttribute('id', ids[i]);

    if (0 === parseInt(i, 10) && !codetabLinks[i].classList.contains('active')) {
      codetabLinks[i].classList.add('active');
    } else {
      codetabLinks[i].classList.remove('active');
    }
  }

  if (codetabContents.length > 0) {
    codetabContents[0].style.display = 'block';
  }
</script>