HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getSelection range</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>Highlight words in this paragraph, then inspect the first range.</p>
  <button id="btn" type="button">Inspect getRangeAt(0)</button>
  <pre id="out">Highlight text first</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var selection = document.getSelection();
      if (!selection || selection.rangeCount === 0) {
        document.getElementById("out").textContent = "No range available";
        return;
      }
      var selRange = selection.getRangeAt(0);
      document.getElementById("out").textContent =
        "startContainer: " + selRange.startContainer.nodeName + "\n" +
        "range text: " + selRange.toString();
    });
  </script>
</body>
</html>

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Document.getSelection — getRangeAt (Try It)