The World Wide Web Consortium (W3C) is the primary international organization responsible for developing and establishing international standards for the Web. In 2008, the Consortium implemented the Web Accessibility Initiative, a set of strategies, standards, and resources designed to make the Web accessible to people with disabilities. Below are links to some of the key components of the initiative.
Dozens more accessibility evaluation tools are available on the W3C site.
Diaz, F. A. (2020). Web Content Management System and accessibility awareness: A comparative study of novice users and accessibility outcomes. https://ro.ecu.edu.au/theses/2301
Gartland, S., Flynn, P., Carneiro, M. A., Holloway, G., de Sousa Fialho, J., Cullen, J., Hamilton, E., Harris, A., Cullen, C. (2022). The state of web accessibility for people with cognitive disabilities: A rapid evidence assessment. Behavioral Sciences, 12(2), 26. http://dx.doi.org/10.3390/bs12020026
McLaughlin, M., & Hoops, J. (2021). Web accessibility in the institutional repository: Crafting user-centered submission policies. The Serials Librarian, 80(1-4), 40-45. http://dx.doi.org/10.1080/0361526X.2021.1868217
Sophia, A. (2021). Web accessibility of the top research-intensive universities in the UK. Sage Open, 11(4) http://dx.doi.org/10.1177/21582440211056614