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CSS Web Components represent a design pattern that uses custom HTML elements styled entirely with modern CSS, avoiding JavaScript for most UI logic. Unlike traditional Web Components, they remain undefined in the browser, require no hydration, and leverage CSS features like container queries, :has() selector, and CSS variables for props-like behavior. This approach delivers better performance, resilience, and maintainability for content-heavy sites. The pattern works especially well with Astro's zero-JS default, though developers must carefully preserve accessibility by wrapping semantic HTML elements rather than replacing them.

CSS Web Components: The Architecture for the Post-JavaScript Era

Tobi

A deep dive into the world of CSS Web Components. Why we should use less JavaScript and more native browser power in 2026 - and how this harmonizes perfectly with Astro.

<p>A deep dive into the world of CSS Web Components. Why we should use less JavaScript and more native browser power in 2026 - and how this harmonizes perfectly with Astro.</p>