HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS ::selection Basic Example</title>
  <style>
    ::selection {
      background-color: #fef08a;
      color: #1e293b;
    }

    ::-moz-selection {
      background-color: #fef08a;
      color: #1e293b;
    }

    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
      color: #334155;
    }
  </style>
</head>
<body>
  <p>Highlight this text to see the custom yellow selection styling applied by ::selection.</p>
</body>
</html>

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CSS ::selection Selector - Basic Highlight