Astro is a modern web framework for content-focused sites that uses an islands architecture and partial hydration to minimize client-side JavaScript. It outputs static HTML, supports multiple UI frameworks and provides adapters for different hosting and SSR scenarios. Developers gain faster load times, streamlined content workflows and easy CMS integration.
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Astro is a web framework that renders static HTML by default and activates interactive components selectively in the browser.
Astro was started in 2021 by Fred K. Schott and the Astro team in response to the growing JavaScript cost of modern websites. Its approach combines islands architecture with components from multiple UI frameworks.
An Astro page is first complete HTML. Only interactive islands load JavaScript where users need it; the rest stays light. React, Vue, or Svelte components can work together.
Interactive areas activate independently in the browser.
Page content is delivered as HTML early.
Multiple UI frameworks can be combined.
Astro fits fast, content-rich websites with a limited number of interactive areas. Less client JavaScript supports short load times; highly interactive applications need careful island boundaries.
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