Creating a subset font
Using custom font faces on a web page introduces several potential issues. Most commonly, these issues manifest in one of two types of problem: the dreaded “flash of unstyled text” (FOUT) or “flash of invisible text” (FOIT); or poor initial render time due to font faces specified in blocking calls to outside services. By placing only a subset font in the critical render path, you can reduce the amount of FOUT/FOIT and speed up the initial render performance.
I'm a Rubyist by trade and maintain Hashie and KSUID for Ruby. I am working to better the IndieWeb experience in Ruby, in particular for the Bridgetown static site generator, which I use to host this website.