ffoodd/a11y.css
This CSS file intends to warn developers about possible risks and mistakes that exist in HTML code. It can also be used to roughly evaluate a site's quality by simply including it as an external stylesheet. observed · 2026-08-28
Health v2 · maintenance only
65/100
- Activity 79
- Release rhythm 28
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: 35
- age_days: 4668
- days_rel: 631
- days_push: 131
- n_releases_24m: 2
Adoption not part of the score
1607 stars · 95 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
a11y.css is a CSS stylesheet that highlights potential accessibility risks and mistakes in HTML markup by displaying visual warnings directly in the browser. It can be included as an external stylesheet to roughly evaluate a site's quality, and is complemented by a companion WebExtension for Firefox, Chrome, and Edge.
Use cases
- audit html pages for accessibility mistakes
- visually flag missing alt attributes and lang attributes
- quickly evaluate a website's markup quality
- force focus visibility while testing keyboard navigation
- check image alternatives in the browser
- run a lightweight accessibility check without a full audit tool
When to choose
- you want a zero-install, stylesheet-only way to spot common HTML accessibility issues
- you need quick visual diagnostics during front-end development
- you want a companion browser extension with extras like focus visibility and text spacing checks
- you need warnings in one of ten supported languages
When to avoid
- you need a comprehensive, standards-compliant accessibility audit with reports (use axe, Lighthouse, or Pa11y)
- you need automated testing in a CI pipeline
- you need screen-reader or WCAG conformance verification rather than markup-level hints
Facets
library · maturity active
accessibility linter testing css-framework accessibility web-development frontend web-design browser browser-extension cross-platform css scss html-diagnostics audit bookmarklet webextension quality-evaluation multilingual
2 sources
- readme: https://github.com/ffoodd/a11y.css · fetched 2026-08-28 · cff23c2ef66a
- homepage: https://ffoodd.github.io/a11y.css · fetched 2026-08-29 · ab489f1f9bee
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| ffoodd/a11y.css | main | 65 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem