HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>collapsed vs range</title>
  <style>
    #out { white-space: pre-wrap; border: 1px solid #ccc; padding: 10px; margin-bottom: 12px; }
  </style>
</head>
<body>
  <pre id="out">Click or select text…</pre>
  <p>Click once for a caret (often isCollapsed: true).</p>
  <p>Drag to highlight for isCollapsed: false and a non-zero text length.</p>
  <script>
    var out = document.getElementById("out");
    document.addEventListener("selectionchange", function () {
      var sel = document.getSelection();
      if (!sel) {
        out.textContent = "No Selection object";
        return;
      }
      out.textContent =
        "isCollapsed: " + sel.isCollapsed +
        "\nrangeCount: " + sel.rangeCount +
        "\ntext length: " + sel.toString().length;
    });
  </script>
</body>
</html>

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Document selectionchange — collapsed vs range (Try It)