HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>blur relatedTarget</title>
</head>
<body>
  <input id="name" placeholder="Name" />
  <input id="email" placeholder="Email" />
  <pre id="out">Focus name, then tab or click email</pre>
  <script>
    var name = document.getElementById("name");
    var out = document.getElementById("out");
    name.addEventListener("blur", function (event) {
      var next = event.relatedTarget;
      out.textContent = "Blurred. Next focus: " +
        (next ? next.tagName + (next.id ? "#" + next.id : "") : "(none)");
    });
  </script>
</body>
</html>

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Element blur — relatedTarget (Try It)