Accessibility

Web pages cannot possibly look the same in every browser or on every device. Achieving such a feat is impossible, considering the expanding possibilities of connecting to the Web via PDAs and cell phones, not to mention the array of screen sizes users prefer. The importance of Web accessibility extends beyond merely accommodating people with disabilities. Accessibility is a helpful option similar to those found in the physical world such as ramps for people riding bicycles or people in wheelchairs. Accessible Web content is beneficial to a variety of people with and without disabilities.
Writing a Web site that looks good in one browser is easy, but writing a Web site that renders true in every browser is difficult. Designers use validator services such as the W3C’s HTML Validator to make sure their content will make sense to every reader. A page “validates” if the coding has been shown to make sense to every type of browser.