HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>focus hint</title>
</head>
<body>
  <label>Email <input id="email" type="email"></label>
  <p id="hint" hidden>We will never share your email.</p>
  <script>
    var email = document.getElementById("email");
    var hint = document.getElementById("hint");
    email.addEventListener("focus", function () {
      hint.hidden = false;
    });
    email.addEventListener("blur", function () {
      hint.hidden = true;
    });
  </script>
</body>
</html>

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Element focus — show hint (Try It)