HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>onfocus onblur demo</title>

  <style>

    input { padding: 0.5rem; border: 2px solid #cbd5e1; border-radius: 6px; }

  </style>

</head>

<body>

  <label>Email:

    <input type="email"

           onfocus="this.style.borderColor='#2563eb'"

           onblur="this.style.borderColor='#cbd5e1'"

           placeholder="you@example.com">

  </label>

  <p><small>Click in and out of the field to see focus events.</small></p>

</body>

</html>

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HTML Basic Events — onfocus & onblur