If you are anything like me, you happily used Pixel (px) in Sketch and Figma during the past years without thinking much about it. It is the unit they gave me. Surely it is correct, and if not, the development team can fix that, no? Plus, there are a lot of people saying my design should be pixel perfect, right?
Christine Vallaure points out that designing only with pixels conflicts with accessibility requirements, and then provides a deep dive on why, and what can be done about it. She is writing for other designers, and developers, but the article will be illuminating for anyone interested in web design and/or accessibility.