Adding alternative text for images is the first principle of web accessibility. It is also one of the most difficult to properly implement. The web is replete with images that have missing, incorrect, or poor alternative text.
When websites and web tools are properly designed and coded, people with disabilities can use them. However, currently many sites and tools are developed with accessibility barriers that make them difficult or impossible for some people to use.
Accessible forms are easy to understand, complete, and submit. Instructions, cues, required form fields, and field formatting requirements must be clearly identified to users. Error recovery must be intuitive and descriptive.