An accessible website is one which allows all Internet users to access its content easily, including people with disabilities who use special browsers.
For example, in an accessible website:

To achieve this, strict standards have to be applied in designing and updating the site.
In keeping with its community and public service values, Gaz de France has made accessibility one of its goals.
Another way to browse: users' stories
Personal account by Catherine Grimaud, a partially sighted user (in French)
Personal account by Caroline Desmerger, a blind user
In 2007, Gaz de France made its corporate website gazdefrance.com accessible. In quick succession, the site was awarded the French AccessiWeb label and the European Euracert label, in acknowledgement of its compliance with accessibility requirements.
Assistance available on gazdefrance.com >>
February 13, 2007: award of the Accessiweb label, bronze level
September 21, 2007: award of the Euracert label, level A
For Gaz de France, universal access to information is a commitment as fundamental as universal access to energy. Building on the experience acquired with its corporate website, the Group is engaged in initiatives aimed at promoting accessibility on a permanent basis.