HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selectionchange log</title>
  <style>
    #out { white-space: pre-wrap; border: 1px solid #ccc; padding: 10px; margin-bottom: 12px; }
    .sample { line-height: 1.6; }
  </style>
</head>
<body>
  <pre id="out">Select any text below…</pre>
  <p class="sample">The Selection API tracks highlighted text on the page. Drag across these words to fire selectionchange.</p>
  <p class="sample">A collapsed caret also counts as a selection change.</p>
  <script>
    var out = document.getElementById("out");
    document.addEventListener("selectionchange", function () {
      var sel = document.getSelection();
      out.textContent = sel
        ? "getSelection(): \"" + sel.toString() + "\"\nisCollapsed: " + sel.isCollapsed
        : "No Selection";
    });
  </script>
</body>
</html>

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Document selectionchange — getSelection log (Try It)