Jan Toman explains the difference between style guides and pattern libraries. (It doesn’t really matter what you call it, as long as the whole team speaks the same language.)
Robin Rendle explores how the `fr` CSS unit can be used in conjunction with CSS Grid to achieve more legible and maintainable code.
Rob Dodson shows how to properly manage focus when adding a modal dialog to the page, and how to prevent a screen reader user from accidentally escaping behind the modal.
Belén Albeza gives a nice introduction to CSS clip-path property.
Maria Antonietta Perna gives an excellent, hands-on introduction to CSS variables (custom properties).