from static method
Creates a DOMNode from dynamic parameter entry.
entry Can be a DOMNode, a String with HTML, a Text,
a Function or an external element.
Implementation
static TRowElement? from(Object? entry) {
  if (entry == null) return null;
  if (_domHTML.isHtmlNode(entry)) {
    entry = _domHTML.toDOMNode(entry);
  }
  if (entry is TRowElement) return entry;
  if (entry is DOMElement) {
    _checkTag('tr', entry);
    return TRowElement(
        attributes: entry._attributes,
        cells: entry._content,
        commented: entry.isCommented);
  }
  return null;
}