Font-family and compatibility cross-OS's
sources:
http://rigaux.org/font-family-compatibility-between-linux-.html
http://www.ars-informatica.ca/article.php?article=59
https://www.granneman.com/webdev/coding/css/fonts-and-formatting/default-fonts
https://www.smashingmagazine.com/2015/11/using-system-ui-fonts-practical-guide/
https://blog.prototypr.io/typography-and-cross-browser-compatibility-fc1fa3b8fa9a
https://css-tricks.com/snippets/css/system-font-stack/
https://www.quora.com/What-are-some-safe-fonts-to-use-cross-platform