A few years ago I volunteered to build a new website for the The Israeli Guide Dog Users Association [IGDU].
The challenge was to create an accessible website, that the organization can use to communicate with both its members (who are blind or partially sighted) and potential collaborators.
I was happy to do it as this was something that I very much wanted to learn. I worked closely with the administrative staff, some are partially sighted, and they introduced me to various tools and mechanisms that help surf the internet without seeing anything: screen readers, Braille keyboards, and more. I learned a lot from this experience.
The website was built in Drupal. In addition, special modules were used to enable changing font size, colors and contrast. The code had to be very strict and valid for everything to work properly.