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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getAnimations count</title>
  <style>
    body{font-family:system-ui,sans-serif;padding:1.5rem;}
    #box{width:48px;height:48px;background:#0ea5e9;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">Animate</button>
  <button id="list" type="button">List</button>
  <pre id="out">Click Animate, then List</pre>
  <script>
    var box = document.getElementById("box");
    document.getElementById("start").addEventListener("click", function () {
      box.animate(
        [{ opacity: 1 }, { opacity: 0.25 }, { opacity: 1 }],
        { duration: 1200, iterations: Infinity }
      );
    });
    document.getElementById("list").addEventListener("click", function () {
      var anims = document.getAnimations();
      document.getElementById("out").textContent =
        "count: " + anims.length + "\n" +
        (anims.map(function (a) { return a.playState; }).join(", ") || "(none)");
    });
  </script>
</body>
</html>

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Document.getAnimations — count playState (Try It)