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a11y.css provides warnings about possible risks and mistakes that exist in HTML code through a style sheet. This extension also provides several accessibility-related utilities. see https://github.com/ffoodd/a11y.css/tree/webextension for details

First a11y.css was a bookmarklet inserting a style shet into the page.

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.
This extension does the same, plus adds some tools:

• Outline focus (keyboard navigation)
• Show languages used (relies on lang attributes)
• Check alt and title attributes on images

You can submit your bugs on github.

Original bookmarklet code: Gaël Poupard
Extension code: Stéphane Deschamps
Thanks to Anthony Ricaud and Mathieu Pillard for their help!