 
	
Latest version 2024.2.426:
Old version 2022.3.906:
Use the following code:
        static void Main(string[] args)
        {
            Console.WriteLine("Test from 2022.3.906 to 2024.2.426.");
            string html = @"<html>
                <head>
                    <style type=""text/css"">
                            h1 {
                               background-color: red;
                              }
                            #highlight1{
                                background-color: blue;
                             }
                           .highlight2{
                                background-color: yellow;
                             }
                     </style>
                </head>
                <body>
                   <h1>H1 - This Works </h1>
                   <h2 id=""highlight1"">H2 with id selector.  This works too.</h2>
                   <h3 class=""highlight2"">H3 with class selector.  This didn't work</h3>
                </body>
                </html>";
            Telerik.Windows.Documents.Flow.FormatProviders.Html.HtmlFormatProvider html_provider = new Telerik.Windows.Documents.Flow.FormatProviders.Html.HtmlFormatProvider();
            RadFlowDocument document = html_provider.Import(html);
            string html_output = "output.html";
            using (Stream output = File.Create(html_output))
            {
                html_provider.Export(document, output);
            }
            Process.Start(new ProcessStartInfo() { FileName = html_output, UseShellExecute = true });
        }