File: closest.html

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<!DOCTYPE html>
<html>
<body>

<div class="demo container"> Grandparent
  <div class="demo container">Parent
    <div id="myElement" class="demo">The outer HTML of closest element will be shown.</div>
  </div>
</div>

<script>
var element = document.getElementById("myElement");
var closest = element.closest(".container");
if (closest) {
  alert(closest.outerHTML);
}
</script>

</body>
</html>