a11y.css’ documentation


Pronounced "Alix".

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 and Polish — and leveled or full.

How to use?

Web Extension

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

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

As a WebExtension, it also enables to:


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!