HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Tab target change</title>
</head>
<body>
  <p>Press Tab between the fields and watch the log.</p>
  <input id="a" placeholder="Field A">
  <input id="b" placeholder="Field B">
  <pre id="out">(waiting)</pre>
  <script>
    var out = document.getElementById("out");
    function label(el) {
      return el.id || el.tagName.toLowerCase();
    }
    document.addEventListener("keydown", function (event) {
      if (event.key !== "Tab") return;
      out.textContent = "keydown on " + label(event.target);
    });
    document.addEventListener("keyup", function (event) {
      if (event.key !== "Tab") return;
      out.textContent += " → keyup on " + label(event.target);
    });
  </script>
</body>
</html>

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Element keyup — Tab target change (Try It)