//string html = null;
object objHtml = null;
string data = ....contents-of-html-file-with-js-not-yet-executed....
using (ThreadRunner threadRunner = new ThreadRunner())
{
    //Create a WebView through the ThreadRunner
    WebView webView = threadRunner.CreateWebView();

    EO.WebEngine.BrowserOptions options = new EO.WebEngine.BrowserOptions();
    options.EnableWebSecurity = false;
    webView.SetOptions(options);
    threadRunner.Send(() =>
    {
        webView.ConsoleMessage += new ConsoleMessageHandler(webView_ConsoleMessage);

        //webView.LoadUrlAndWait(htmlfilename);
        webView.LoadHtmlAndWait(data); //, workingdir);

        //fully resolve the webpage
        //html = webView.GetHtml();
        objHtml = webView.EvalScript("document.documentElement.outerHTML", true);
    });

    webView.Destroy();
}
....do-something-with-objHtml.ToString()....
...
private List<string> m_Messages = new List<string>();
void webView_ConsoleMessage(object sender, ConsoleMessageEventArgs e)
{
    string message = string.Format("{0} line# {1}:{2}", e.Source, e.LineNumber, e.Message);
    m_Messages.Add(message);
}
...