如何验证位于Div/small/d标签C#下的How元素的文本

using HtmlAgilityPack;

// 加载 HTML 代码
string htmlCode = "<div><small><d><span>How</span></d></small></div>";
HtmlDocument htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(htmlCode);

// 获取元素
HtmlNode divNode = htmlDoc.DocumentNode.SelectSingleNode("//div");
HtmlNode smallNode = divNode.SelectSingleNode(".//small");
HtmlNode dNode = smallNode.SelectSingleNode(".//d");
HtmlNode howNode = dNode.SelectSingleNode(".//span");

// 验证文本
string howText = howNode?.InnerText;
if (howText == "How")
{
    Console.WriteLine("文本验证通过");
}
else
{
    Console.WriteLine("文本验证失败");
}