Why "It Works on My Machine" Is a Website Design Problem, Not Just a Dev Problem

Every developer has said it. Every designer has heard it and rolled their eyes a little. But here's the thing: "it works on my machine" isn't just a testing failure. In 2026, it's often a design and architecture failure that was baked in way earlier than anyone wants to admit. I've been thinking about this a lot lately after working through a few web projects where the gap between "looks great in Figma" and "actually works for real users on real devices" was... wider than it should have been. Th