private static void FindChildren(IHtmlElement source, HtmlTag tag, HtmlElementSeletor result)
{
foreach (var item in source.Children())
{
if (!(item is HtmlElement))
{
continue;
}
var element = item as HtmlElement;
if (element.Tag == tag)
{
result.AddElement(element);
}
FindChildren(element, tag, result);
}
}