HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>caretRangeFromPoint click</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} p{cursor:text;max-width:32rem;line-height:1.6;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <p id="para">Click anywhere in this paragraph to read the Range at that point.</p>
  <pre id="out">Click the paragraph</pre>
  <script>
    document.getElementById("para").addEventListener("click", function (e) {
      var out = document.getElementById("out");
      if (typeof document.caretRangeFromPoint !== "function") {
        out.textContent = "document.caretRangeFromPoint not supported";
        return;
      }
      var range = document.caretRangeFromPoint(e.clientX, e.clientY);
      if (!range) {
        out.textContent = "null";
        return;
      }
      out.textContent = JSON.stringify({
        nodeName: range.startContainer.nodeName,
        nodeType: range.startContainer.nodeType,
        offset: range.startOffset
      }, null, 2);
    });
  </script>
</body>
</html>

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Document.caretRangeFromPoint — click Range (Try It)