HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>out vs leave counts</title>
  <style>
    #parent { display: flex; gap: 8px; padding: 16px; border: 2px solid #333; }
    .kid { width: 70px; height: 70px; background: #e8f5e9; display: grid; place-items: center; }
  </style>
</head>
<body>
  <div id="parent">
    <div class="kid">A</div>
    <div class="kid">B</div>
    <div class="kid">C</div>
  </div>
  <pre id="out">mouseout=0 mouseleave=0</pre>
  <script>
    var parent = document.getElementById("parent");
    var out = document.getElementById("out");
    var outCount = 0;
    var leaveCount = 0;
    parent.addEventListener("mouseout", function () {
      outCount++;
      render();
    });
    parent.addEventListener("mouseleave", function () {
      leaveCount++;
      render();
    });
    function render() {
      out.textContent = "mouseout=" + outCount + " mouseleave=" + leaveCount;
    }
  </script>
</body>
</html>

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Element mouseout — count vs mouseleave (Try It)