Who is actually responsible for Web Accessibility?

Who is responsible for making sure software is accessible? If your short answer is the front-end development team, I'm sorry to say that your software will never be universally accessible, because many accessibility decisions are made long before a developer begins working on a component. Architecture, design, and, yes, requirements all play a part in ensuring that whatever software is developed is perceivable and operable by people with differing characteristics. In all the agile teams I've bee