html tags

        static void WriteHtml(HtmlNode rootNode, int indent)
        {

            html.Append(new string(' ', indent * 4) + $"<{rootNode.Name}");
            foreach (var attr in rootNode.Attributes)
            {
                html.Append($" {attr.Name}=\"{attr.Value}\"");
            }
            html.Append(">");

            if (rootNode.ChildNodes.Count > 0)
            {
                html.AppendLine();
                foreach (var node in rootNode.ChildNodes)
                {
                    WriteHtml(node, indent + 1);
                }
                html.AppendLine(new string(' ', indent * 4) + $"</{rootNode.Name}>");
            }
            else
            {
                html.AppendLine($"</{rootNode.Name}>");
            }
        }