HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selected text</title>
  <style>
    #out { border: 1px solid #ccc; padding: 10px; margin-bottom: 12px; }
  </style>
</head>
<body>
  <pre id="out">(nothing selected)</pre>
  <p>Hello world — select these words to see the selected text appear above.</p>
  <p>Selection works across multiple paragraphs too.</p>
  <script>
    var out = document.getElementById("out");
    document.addEventListener("selectionchange", function () {
      var text = String(document.getSelection() || "");
      out.textContent = text
        ? 'Selected: "' + text + '"'
        : "(nothing selected)";
    });
  </script>
</body>
</html>

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Document selectionchange — selected text (Try It)