HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>user-select: none</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    .btn {
      background: #2563eb;
      color: #fff;
      border: 0;
      padding: 12px 16px;
      font: inherit;
      cursor: pointer;
      -webkit-user-select: none;
      user-select: none;
    }
  </style>
</head>
<body>
  <p>Try selecting the button label — selection should fail.</p>
  <button type="button" class="btn">Click me</button>
</body>
</html>

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CSS user-select Property — none