Progressive Enhancement
Build the reliable core first, then add JavaScript or styling upgrades without breaking the base flow.
Core Idea
Progressive enhancement starts with semantic HTML and server rendering so forms, navigation, and content work even on constrained devices. Enhancements—JavaScript hooks, transitions, or optimistic states—layer on top using feature detection. If the extra layer fails, the baseline still succeeds, so you can ship reliability without sacrificing polish.
Why It Matters Here
Mathbong's Svelte curriculum leans on this mindset when explaining form actions, slot layouts, and optimistic updates. By locking in a dependable baseline first, every enhancement—use:enhance, optimistic stores, animated dashboards—feels like an optional upgrade rather than a fragile dependency.