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@ppk Fascinating reading list, still working my way through it. For CSS, arguably anything with a vendor prefix chain is PE (e.g., perishablepress.com/css3-progressive-enhancement-smart-design/) or anything that makes use of @supports (e.g., smashingmagazine.com/native-css-masonry-layout-css-grid/#fallback-behavior for CSS masonry layout).On twitter.com
Mood +3 🙂