A deep dive into progressive enhancement as a CSS and web development principle, covering how to build websites layer by layer (HTML → CSS → JS) for better accessibility and browser compatibility. Topics include CSS error handling as a built-in progressive enhancement mechanism, using @supports feature queries to serve modern CSS only to capable browsers, and a JS module-based technique to detect modern browsers and conditionally apply enhanced components like accordions. Practical code examples illustrate each concept, including toggle switches, CSS Grid with flexbox fallbacks, shape-outside, and accessible accordion patterns.
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