selectMatchingElements method
Implementation
List<dom.Element> selectMatchingElements(dom.Element? element) {
if (element == null) return [];
if (selector == null) return [element];
return (maxCount > 1 || maxCount <= 0)
? element.querySelectorAll(selector!)
: [element.querySelector(selector!)].where((element) => element != null).map((e) => e!).toList();
}