HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>onmouseover</title>
  <style>
    #stage { padding: 24px; border: 2px solid #333; }
    #stage span { display: inline-block; padding: 8px; background: #e3f2fd; }
  </style>
</head>
<body>
  <div id="stage">Outer <span>child</span></div>
  <pre id="out">(waiting)</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    stage.onmouseover = function (event) {
      out.textContent = "mouseover on " + event.target.tagName.toLowerCase();
    };
  </script>
</body>
</html>

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Element mouseover — onmouseover (Try It)