Accessibility
The design of an effective interface will also be given the possibility that different users have different possibilities to access a site that provides content (web design focuses on the user), but this leads to more web design for each type of visitor. 

An example may be the point where a person found Dalton with a red and green, the vibration of these two colors is very similar and may be illegible for this sector of people, and not for non daltónicas .

Accessibility standards in web design not only allow access to information for people with different abilities, but also help a much broader support in a number of very different browsers.