I have installed PdfSharp + HTML-Renderer. Both are of the latest possible versons.
PdfSharp has a new FontResolver since of version 1.50 beta 2 http://www.pdfsharp.net/wiki/FontResolver-sample.ashx

If to create and apply this FontResolver, PdfSharp itself resolves and loads custom/private fonts correctly, but HTML-Renderer does not.

If there is no font with a certain name in the system, HTML-Renderer does not resolve it with FontResolver — it first substitute familyName with 'Segoe UI' and only after that calls the FontResolver.
If a font is installed, HTML-Renderer recognises it and passes the familyName to the FontResolver.

I need to resolve two fonts and as workaround I use well-known fonts in css like Verdana, Tahoma, Impact, and replace them with custom/private fonts in the FontResolver.

Is it a bug or I just have not found the right way to let HTML-Renderer know about the custom/private fonts?