Perhaps Arial is always embeded if no default font is specified as body style, just a guess.
As far i figured out, the PDFs are created by Skia. In the PDF document properties the PDF Producer is "Skia/PDF m55".
I asked in the Skia forum
https://groups.google.com/forum/#!forum/skia-discuss and a very kind guy provided a code change for not embeding fonts.
I will try this, hope i can get CEF compiled in Windows without too much work... and then i must see how it works with CefSharp.....
Yes, i also considered to use the Windows 10 print to pdf, but as you say there is no way to print without user interaction in CEF for Windows.
Is this forum the right place to ask for a silent printing feature, or is this something for the Chromium forum?
I printed a simple PDF created by Skia to "Print to PDF", it looked not bad and the file size was much smaller than the original PDF.
If the Skia code change does not work, maybe i try this strange approach.