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.
From Gov.uk's series on writing web content: People read differently on the web than they do on paper. This means that the best approach when writing for the web is different from writing for print.
Content strategy focuses on the planning, creation, delivery, and governance of content. Content not only includes the words on the page but also the images and multimedia that are used.
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.
In order to help web designers, developers, and evaluators choose an appropriate tool for their purposes, this article discusses the general types or classifications of accessibility tools.