HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getAnimations cancel</title>
  <style>
    body{font-family:system-ui,sans-serif;padding:1.5rem;}
    #box{width:48px;height:48px;background:#f59e0b;border-radius:6px;}
    button{margin:0.75rem 0.5rem 0 0;}
    pre{border:1px solid #ccc;padding:0.75rem;}
  </style>
</head>
<body>
  <div id="box"></div>
  <button id="start" type="button">Start</button>
  <button id="cancel" type="button">Cancel all</button>
  <pre id="out">Ready</pre>
  <script>
    var box = document.getElementById("box");
    var out = document.getElementById("out");
    document.getElementById("start").addEventListener("click", function () {
      box.animate(
        [{ transform: "rotate(0deg)" }, { transform: "rotate(360deg)" }],
        { duration: 1500, iterations: Infinity }
      );
      out.textContent = "count: " + document.getAnimations().length;
    });
    document.getElementById("cancel").addEventListener("click", function () {
      document.getAnimations().forEach(function (animation) {
        animation.cancel();
      });
      out.textContent = "remaining: " + document.getAnimations().length;
    });
  </script>
</body>
</html>

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Document.getAnimations — cancel all (Try It)