HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>caretRangeFromPoint split</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;max-width:36rem;} p{cursor:text;line-height:1.6;}</style>
</head>
<body>
  <p id="para">Click to insert a line break at the character nearest your click.</p>
  <pre id="out">Click the paragraph</pre>
  <script>
    function insertBreakAtPoint(e) {
      var textNode, offset;
      if (document.caretPositionFromPoint) {
        var pos = document.caretPositionFromPoint(e.clientX, e.clientY);
        textNode = pos && pos.offsetNode;
        offset = pos && pos.offset;
      } else if (document.caretRangeFromPoint) {
        var range = document.caretRangeFromPoint(e.clientX, e.clientY);
        textNode = range && range.startContainer;
        offset = range && range.startOffset;
      } else {
        document.getElementById("out").textContent = "No caret API";
        return;
      }
      if (textNode && textNode.nodeType === 3) {
        var replacement = textNode.splitText(offset);
        var br = document.createElement("br");
        textNode.parentNode.insertBefore(br, replacement);
        document.getElementById("out").textContent = "Inserted br at offset " + offset;
      }
    }
    document.getElementById("para").addEventListener("click", insertBreakAtPoint);
  </script>
</body>
</html>

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Document.caretRangeFromPoint — split text MDN (Try It)