HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>leave destination</title>
  <style>
    #outer { padding: 24px; border: 2px solid #333; }
    #inner { margin: 12px; padding: 20px; background: #e8f5e9; }
    #other { margin-top: 12px; padding: 16px; border: 2px dashed #666; }
  </style>
</head>
<body>
  <div id="outer">
    Outer
    <div id="inner">Inner child</div>
  </div>
  <div id="other">Other target</div>
  <pre id="out">(waiting)</pre>
  <script>
    var outer = document.getElementById("outer");
    var out = document.getElementById("out");
    outer.addEventListener("mouseleave", function (event) {
      out.textContent =
        "left outer (to " +
        ((event.relatedTarget && event.relatedTarget.id) || "outside") +
        ")";
    });
    outer.addEventListener("mouseenter", function () {
      out.textContent = "inside outer";
    });
  </script>
</body>
</html>

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Element mouseleave — leave destination (Try It)