Exploring Features in Modern CSS
summary
Covers 7 features added to CSS with concrete demos and tooling: uses caniuse.com for support stats (flexbox example at 98%) and PostCSS with postcss-preset-env for polyfills. Shows :has used to reveal an email validation hint without JavaScript, demonstrates container queries by switching a cat-list layout when a resizable sidebar changes, and explains cascade layers, aspect-ratio, accent-color, nesting, and custom selectors (noted at 0% support but polyfillable). Each demo is shown working in-browser.
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