HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :focus-visible Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    :focus {
      outline: none;
    }

    :focus-visible {
      outline: 2px solid #2563eb;
      outline-offset: 2px;
    }

    button {
      padding: 0.6rem 1.2rem;
      background: #2563eb;
      color: #fff;
      border: none;
      border-radius: 0.5rem;
      font-weight: 600;
      cursor: pointer;
      font-size: 1rem;
      margin-right: 0.5rem;
    }

    a {
      color: #2563eb;
    }
  </style>
</head>
<body>
  <button type="button">Primary action</button>
  <a href="#">Learn more</a>
  <p><small>Tab with keyboard to see :focus-visible rings. Mouse clicks may not show them.</small></p>
</body>
</html>

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CSS :focus-visible Selector