HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getSelection collapsed</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} p{line-height:1.6;} [contenteditable]{border:1px dashed #888;padding:0.75rem;margin:0.75rem 0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <p>Click inside the box (caret) or highlight text, then check.</p>
  <div contenteditable="true">Editable sample text — try both caret and highlight.</div>
  <button id="btn" type="button">Check isCollapsed</button>
  <pre id="out">Try selecting or placing the caret</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var selection = document.getSelection();
      if (!selection || selection.isCollapsed) {
        document.getElementById("out").textContent =
          "No text highlighted (caret only or empty)";
      } else {
        document.getElementById("out").textContent =
          "Highlighted: " + selection.toString();
      }
    });
  </script>
</body>
</html>

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Document.getSelection — collapsed check (Try It)