Accessibility should be a key requirement for any website project. Unfortunately, it is often regarded as an add-on with low priority for most businesses and developers.
Drupal is the #1 platform for web content management systems. It powers millions of websites in more than 180 languages, with a massive online community with more than 26,000 constantly building and sharing themes and resources.
To err is human, and coders too, like us are humans and are bound to make mistakes while coding, especially if the needs of the project are complex and if they adhere to the true meaning of agile.