Standards for internet websites are governed by a non profit organization: the World Wide Web Consortium, or W3C.
These standards are not enforced by law, but nevertheless widely accepted and used, to guarantee a high level of compatibility between all players in the field.
Our sites are following these standards:
Above all, as a general principle for delivering a proper job, but also...
...to make sure your site is correctly treated by search engines. If your site is structured in a clear and concise way, search engines will pick up texts and images with the relevance level you intended for them when designing the site.
...to make your site look the same to all users. Using standards has the effect of giving your site a consistent look in every browser used by your visitors, be it Internet Explorer, Firefox, Safari, Opera, Chrome, etc.
With a little extra effort, standards even allow your site to be available in a usable form on mobile phones.
People with visual disabilities also surf on the web! They often use software that reads pages to them, and helps them to navigate without the use of the traditional point-and-click.
Full web accessibility is still a long way off, and even though the W3C has published several recommendations in that area (like WCAG2.0), there is a lot of work involved, and it is often very difficult to verify the results. A number of quality labels are available, but obtaining them is a difficult task.
Making websites accessible to people with disabilities (with or without a label), requires a lot of study, a journey that Babelsite has already started upon.