HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>caretPositionFromPoint shadow</title>
  <style>
    body { font-family: system-ui, sans-serif; padding: 1.5rem; }
    #host { color: #b45309; font-weight: bold; cursor: text; }
    pre { border: 1px solid #ccc; padding: 0.75rem; margin-top: 1rem; }
    label { display: block; margin: 0.5rem 0; }
  </style>
</head>
<body>
  <p>Click the <span id="host"></span> shadow text below.</p>
  <label><input type="checkbox" id="useShadow"> Pass shadowRoots to caretPositionFromPoint</label>
  <pre id="out">Click shadow text</pre>
  <script>
    var host = document.getElementById("host");
    var shadow = host.attachShadow({ mode: "open" });
    shadow.innerHTML = "<span>Shadow text inside component</span>";
    var useShadow = document.getElementById("useShadow");
    var out = document.getElementById("out");

    document.addEventListener("click", function (e) {
      if (typeof document.caretPositionFromPoint !== "function") {
        out.textContent = "Not supported";
        return;
      }
      var opts = useShadow.checked ? { shadowRoots: [shadow] } : undefined;
      var pos = document.caretPositionFromPoint(e.clientX, e.clientY, opts);
      if (!pos) {
        out.textContent = "null";
        return;
      }
      out.textContent = JSON.stringify({
        shadowRootsPassed: useShadow.checked,
        nodeName: pos.offsetNode.nodeName,
        nodeType: pos.offsetNode.nodeType,
        offset: pos.offset,
        inShadow: shadow.contains(pos.offsetNode)
      }, null, 2);
    });
  </script>
</body>
</html>

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Document.caretPositionFromPoint — shadowRoots (Try It)