Inline JS scripts when using deferred dependencies

index.html

<!-- Example: Load jQuery using defer -->
<script defer src="path/to/jquery.js"></script>

<!-- Inline script that waits for deferred jQuery to load before executing -->
<script>
  window.addEventListener('DOMContentLoaded', function() {
    (function($) {
      // Put your custom code here
    })(jQuery);
  });
</script>