HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>onfocus + onblur hint</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}label{display:block;font-size:.8125rem;font-weight:500;margin-bottom:.35rem}input{display:block;width:100%;max-width:280px;padding:.5rem .75rem;border:1px solid #cbd5e1;border-radius:8px;font-size:.875rem}.hint{margin-top:.5rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Focus hint pattern</h1>

  <p>Helper text appears only while the email field is focused.</p>

  <label for=email>Email</label>

  <input type=email id=email placeholder=you@example.com>

  <p class=hint id=email-hint hidden>Use your work or personal email address.</p>



  <script>var field=document.getElementById("email"),hint=document.getElementById("email-hint");field.addEventListener("focus",(function(){hint.hidden=!1})),field.addEventListener("blur",(function(){hint.hidden=!0}))</script>

</body>

</html>

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HTML onfocus Attribute — Pair with onblur