Don't use font icons, I use svg icons with <svg fill="currentColor" /> and works great. Much easier to customize when you need to in my opinion.
https://fontawesome.com/docs/web/dig-deeper/webfont-vs-svg
One of the key notes in the bottom table on that page is "Auto-Accessibility" and the JS libraries with SVG icons provide better accessibility out of the box. Most of the document you linked is stuff you need to do manually by default when working with web fonts.