HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS ::selection Scoped Example</title>
  <style>
    h1::selection {
      background-color: #16a34a;
      color: #ffffff;
    }

    p::selection {
      background-color: #2563eb;
      color: #ffffff;
    }

    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      color: #334155;
    }

    h1 {
      font-size: 1.35rem;
      margin: 0 0 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Scoped selection</h1>
  <p>Select the heading for a green highlight. Select this paragraph for a blue highlight.</p>
</body>
</html>

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CSS ::selection Selector - Scoped Styles