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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.

Install / Use

/learn @ffoodd/A11y.css

README

a11y.css

Pronounced Alix. Because it’s simpler.

GitHub version

Introduction

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.

CSS files are available in French, English, Spanish, Greek, Arabic, Portuguese, Russian, Chinese, Polish and Dutch — and leveled or full.

How to use?

WebExtension

Either you're using Firefox, Edge or Chrome, you're invited to install and use a11y.css's webextension — which has its own repository.

It provides some nice features not included in the main CSS file (for now), such as:

  • force focus visibility;
  • show lang attributes;
  • check images' alternatives by displaying them;
  • increase text spacings.

As a WebExtension, it also enables to:

  • toggle CSS and change level on the fly,
  • remember settings for each tab,
  • automatically update in the background.

Contribution & customisation

If you want to get involved in this project, be sure to take a look at its wiki. I'll be pleased to read your issues or pull requests!

View on GitHub
GitHub Stars1.6k
CategoryDevelopment
Updated6d ago
Forks95

Languages

SCSS

Security Score

100/100

Audited on Mar 25, 2026

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