HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>transitionend listener</title>
  <style>
    .transition {
      width: 80px;
      height: 80px;
      background: #dc2626;
      transition: transform 0.8s, background 0.8s;
    }
    .transition.grown {
      transform: rotate(90deg);
      background: transparent;
    }
  </style>
</head>
<body>
  <div class="transition" id="box"></div>
  <pre id="out">Transitioning...</pre>
  <script>
    var box = document.getElementById("box");
    var out = document.getElementById("out");
    var count = 0;
    box.addEventListener("transitionend", function () {
      count += 1;
      out.textContent = "Transition ended (" + count + ")";
    });
    box.classList.add("grown");
  </script>
</body>
</html>

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Element transitionend — addEventListener (Try It)