Astro Accessibility Checker

Astro has emerged as one of the fastest-growing web frameworks, with over 800,000 weekly npm downloads and adoption by documentation sites, blogs, marketing pages, and e-commerce storefronts. Astro's "islands architecture" ships zero JavaScript by default, hydrating interactive components only where needed.

This approach is inherently good for accessibility: less JavaScript means fewer runtime failures, faster load times for assistive technology users on slower devices, and content that's immediately available in the HTML. But zero-JS doesn't mean zero accessibility issues — semantic markup, ARIA attributes, heading hierarchy, and color contrast still require developer attention. With web accessibility lawsuits exceeding 4,600 in 2024 and the European Accessibility Act in force, Astro developers must validate compliance on their deployed sites.

Astro's static-first output is a strong foundation, but CompliScan identifies these recurring issues across Astro websites:

• Content collection pages with inconsistent heading levels — Astro's content collections pull from Markdown/MDX files written by different authors, often producing pages where heading levels jump from H2 to H5 or skip levels entirely.
• Interactive islands without keyboard support — React, Vue, or Svelte components hydrated as Astro islands may implement mouse-only interactions, breaking keyboard operability within the island boundary.
• Missing page-level ARIA landmarks — Astro layouts define the page shell, but many starter themes omit <main>, <nav>, and <aside> landmark elements, forcing screen reader users to navigate without structural signposts.
• Image optimization without alt text — Astro's <Image> component handles responsive images and optimization, but passing an empty alt without marking the image as decorative creates accessibility failures.

Run a free CompliScan scan on your deployed Astro site. Because Astro outputs mostly static HTML, the scanner provides fast, accurate results that reflect exactly what users and search engines see.

For content collections, add a linting step that validates heading hierarchy in Markdown files before build — tools like remark-lint-heading-increment catch level skips. For interactive islands, ensure each hydrated component is fully keyboard operable and includes proper ARIA attributes. For layouts, add <main id="main-content"> and a skip navigation link in your base Layout.astro component.

Astro's build-time rendering means most accessibility issues are deterministic — they'll be the same on every page load. CompliScan's Shield plan ($49/mo) scans up to 3 sites weekly, catching issues introduced by content updates and dependency changes.

Astro websites are subject to the same legal frameworks as any website. The ADA Title II April 24, 2026 deadline applies to government sites built with Astro, while the European Accessibility Act covers commercial websites serving EU users. Private U.S. websites face ADA Title III enforcement, with courts using WCAG 2.1 AA as the compliance benchmark.

Astro's minimal JavaScript footprint means fewer dynamic accessibility failures, but static HTML can still have contrast issues, missing alt text, empty links, and broken heading hierarchies. Automated scanning catches approximately 30-40% of WCAG 2.1 AA criteria — particularly effective for content-heavy Astro sites where the most common issues are structural and textual.

For documentation sites and technical content (a primary Astro use case), accessibility is especially critical. Starlight, Astro's documentation theme, includes good accessibility defaults, but customizations and additional content must maintain those standards.