HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getSelection basic</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} p{line-height:1.6;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <p>Select some of this text, then click the button.</p>
  <button id="btn" type="button">Read selection</button>
  <pre id="out">Highlight text first</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var selection = document.getSelection();
      document.getElementById("out").textContent =
        "type: " + (selection && selection.type) + "\n" +
        "rangeCount: " + (selection && selection.rangeCount) + "\n" +
        "isCollapsed: " + (selection && selection.isCollapsed);
    });
  </script>
</body>
</html>

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Document.getSelection — get Selection object (Try It)