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Astro in Homepage Source

Astro is a content-focused web framework that ships zero JavaScript by default and hydrates interactive islands only where needed, so most Astro pages are static HTML.

The source-code fingerprint

Astro hydrates interactive components as client islands, each rendered inside an <astro-island> custom element, so the astro-island tag appears on any Astro page that ships at least one interactive component.

Likely false positives: A floor by design: Astro's zero-JS default means fully static pages carry no <astro-island> and aren't counted; the broader /_astro/ asset path catches them but inflates the total with unverified trigram candidates.

Stored source examples for Astro

These examples matched astro-island in stored homepage source when the query was sampled on 2026-10-14. The sites may have changed since the source was captured. A match establishes a source reference; it does not confirm an active installation or code execution.

• www.cloudflare.com ...tems-center lg:justify-center" data-nav-scroll-tabs> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• blog.cloudflare.com ... class="pointer-events-auto" data-astro-cid-u3ezd34w><style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.ikea.com ...ef="/global/en/_astro/Startpage.B3hWtVtJ.css"></head><body><astro-island uid="1PE7jl" component-url="/global/en/esi/header/_astro/He...
• forum-europaeum.com ..."flex justify-between items-center pt-2 mb-8"> <nav> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.virestudiofotografico.com ...778813346649/Page.BqKXmfKT.css"></head> <body> <div> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• proton.me ...((node) => {\n\t\t\tconst anchor = node;\n\t\t\tif (anchor.closest("astro-island")) return;\n\t\t\ttry {\n\t\t\t\tconst url = new URL(anchor.href, wi...
• nordvpn.com ...t" href="/static/index.DIUx6pPZ.css"></head> <body> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.cognitoforms.com ...-bottom:.5em}ul{margin-top:0}hr{margin-top:2rem}:where(:not(astro-island>*)):first-child,:where(astro-island:first-child)>:first-chi...
• www.nerdwallet.com ...ass="segment-tracking-scope" data-astro-cid-4ddih5sx><style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• crowdin.com ...bg-background"><!-- Header with shadcn Navigation --><style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.klaviyo.com ....DEs-vRVO.js"></script></head><body class="special"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• stackblitz.com ...iv> <div class="nav-links" data-astro-cid-ju4v47fh> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.blurb.com ...o get started?</h2> </div> <div class="flex gap-6"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• developers.openai.com ...></path><path d="m6 6 12 12"></path></svg> </button> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.audacityteam.org ...te-header" class="z-50 sticky left-0 right-0 top-0"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.jimdo.com ...gation" data-tracking-label="topnav_login">Log In</a><style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.roku.com ...v>\t\t\t\n\t\t\t\t<div id="ks-nav-footer-container"><footer> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><astr...
• www.eweek.com ...tion-2bf.pages.dev/_astro/page.B3jLyu08.js"></script><style>astro-island,astro-slot,astro-static-slot{display:contents}</style><styl...
• swagger.io ...> </div> </section> <section class="my-20 lg:my-30"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• seositecheckup.com ...er gap-2" aria-label="Account actions" role="group"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• protonvpn.com ...((node) => {\n\t\t\tconst anchor = node;\n\t\t\tif (anchor.closest("astro-island")) return;\n\t\t\ttry {\n\t\t\t\tconst url = new URL(anchor.href, wi...
• expressjs.com ...ontent" class="skip-link sr-only">Skip to content</a><style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.semafor.com ...</script></head> <body style="overflow-x: hidden;"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.netlify.com ...)});</script> <section class="wrapper l-breakout"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.claris.com ...;background-repeat:no-repeat}\n</style></head> <body> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.reclameaqui.com.br ...-[900px] overflow-x-auto w-full astro-VF6PH3Q6">\n <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• tuta.com ...CuIdOo1c.js"></script></head> <body class="default"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.affinidi.com ...17 _hero_1u9wu_165"> <div class="_heroBg_1u9wu_175"> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.kohls.com ...eturn!0}}}}()}(window);</script></head> <body class> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...
• www.blinkist.com ...wth-assets/page.SnuCpsh-.js"></script></head> <body> <style>astro-island,astro-slot,astro-static-slot{display:contents}</style><scri...

Showing 30 checked source examples. The headline is estimated matches. Open the full ranked list, inspect the matched source, and export the domain list →

Related technologies

How this works

The headline distinguishes candidate upper bounds (index prefilter), estimated matches (a projection from checked samples) and verified matches (an exact count established by the engine). The index contains 131,219,565 homepage documents, one homepage per hostname, including subdomains. The source index was promoted 2026-09-22 and follows a quarterly rebuild schedule. The sample date is when this query was checked against the stored index, not a new crawl of each example site.

Comparing adoption across tools? The Web Technology Adoption Report ranks the most common tags in the index side by side.