public static void TrimWhitespace(
this HtmlNode document)
{
var textNodes = document.SelectNodesAsList("//text()").Where(
n => string.IsNullOrWhiteSpace(n.InnerHtml));
foreach (var textNode in textNodes)
{
textNode.Remove();
}
var commentNodes = document.SelectNodesAsList("//comment()").Where(
n => n.InnerHtml != "<!DOCTYPE html>");
foreach (var commentNode in commentNodes)
{
commentNode.Remove();
}
}