Accessibility should be an essential requirement for any website project. Unfortunately, it is often seen as a complement with low priority for most businesses and developers. The biggest mistake is to assume that the proportion of people with accessibility requirements is small and insignificant and that the focus on accessibility will only result in a "tiny" subgroup of users. However, this is certainly not the case, and ignorance of accessibility lacks an opportunity for all your users. Why is accessibility important? Nearly one in five people in the United States have a disability, and more than half of adults with disabilities are online (Interactive Accessibility, 2012). Disabilities include little or no use of the senses such as vision and hearing, as well as difficulty with motor skills, such as emergency and management. This means that some of your users will not be able to see or hear what is happening on a web page, while others will have troubl...