HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>onfocusin</title>
</head>
<body>
  <form id="form">
    <label>Email <input name="email" type="email"></label><br>
    <label>Name <input name="name" type="text"></label>
  </form>
  <pre id="out">(waiting)</pre>
  <script>
    var form = document.getElementById("form");
    var out = document.getElementById("out");
    form.onfocusin = function (event) {
      out.textContent = "focusin on " + (event.target.name || event.target.tagName);
    };
    form.onfocusout = function () {
      out.textContent = "(no field focused)";
    };
  </script>
</body>
</html>

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Element focusin — onfocusin (Try It)