HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>animationend listener</title>
  <style>
    .animated {
      width: 80px;
      height: 80px;
      background: #2563eb;
      animation: pulse 0.8s ease-out 1;
    }
    @keyframes pulse {
      from { transform: scale(0.5); opacity: 0.4; }
      to { transform: scale(1); opacity: 1; }
    }
  </style>
</head>
<body>
  <div class="animated" id="box"></div>
  <pre id="out">Animating...</pre>
  <script>
    var box = document.getElementById("box");
    var out = document.getElementById("out");
    box.addEventListener("animationend", function () {
      out.textContent = "Animation ended";
    });
  </script>
</body>
</html>

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Element animationend — addEventListener (Try It)