The Acquia blog has posted a few helpful usability tips for developers to help you think about how users will be interacting with the systems they create. This post is the first in a four part series and kicks off the content with four good tips.
Creating the code that makes a website accessible to all visitors doesn't have to be as time-consuming or resource-intensive as you might think. All you need to do is follow some simple steps that require a little extra time and effort. [...] It's up to both the developer and the client to achieve site accessibility. Although they usually work together in the planning and later stages of website creation, a developer and client also have separate responsibilities in making a site accessible.
In this post they touch on points around the use of "read more", clear requirements for input and good error messaging practices.
Link: https://www.acquia.com/blog/web-accessibility-tips-developers