How do you dynamically customize the programming language available in a context within an existing system, without changing the underlying system? This dissertation introduces a language design approach that addresses this problem. The basic idea is to structure programs as systems of multiple interacting levels of abstraction, where all of the…

Introduction: Website accessibility is a problem that affects millions of people with disabilities. While most current accessibility initiatives target government or commercial sites, a growing segment of online content is being created by non-professionals. This content is often inaccessible to users with disabilities. Everyday inclusive Web…