HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>focusin form</title>
</head>
<body>
  <form id="form">
    <label>Some text: <input type="text" name="text" placeholder="text input"></label><br>
    <label>Password: <input type="password" name="password" placeholder="password"></label>
  </form>
  <script>
    var form = document.getElementById("form");
    form.addEventListener("focusin", function (event) {
      event.target.style.background = "pink";
    });
    form.addEventListener("focusout", function (event) {
      event.target.style.background = "";
    });
  </script>
</body>
</html>

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Element focusin — form delegation (Try It)