Examples of websites using
Source Serif
(Source Serif is a serif font designed by Frank Grießhammer. It offers multiple styles and weights, providing a versatile range of options for various design needs)
with
Self modern
(Self Modern is a serif font designed by Lucas Le Bihan and released by Bretagne in 2016. The font family includes an undisclosed number of styles, each offering a distinct and modern interpretation of the classic serif design)