Despite persistent effort, many web pages are still not acces sible to everyone. Fixing web accessibility problems can be complicated. Developers need to have extensive knowledge not only of possible accessibility problems but also of appro aches for fixing them. This paper is about using the large number of accessibility issues on real websites and crowdsourced fixes for them as a unique source of learning materi als for web developers to learn how to build accessible com ponents in a cost-efficient manner. In this paper, we present the design, development and study of CAN (Composable Accessibility Infrastructure), a crowdsourcing infrastructure that collects web accessibility issues and their fixes, dynami cally composes solutions on-the-fly, and delivers the crowdsourced content as teaching materials. Our unique CAN user interaction and system design enables end users with disabilities to both benefit from and contribute to the sys tem without additional effort in their daily web browsing, and allows web developers to experience real accessibility issues and initiate a learning process with first-hand materi als. CAN also provides an opportunity for data-driven dis covery of the common implementation practices that cause accessibility issues. We show how CAN addresses a set of accessibility issues on the top 100 popular websites. We also present our user study results where web developers who had varying knowledge of web accessibility all found our system an effective and interesting platform to learning web acces sibility.

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Drag and Drop (DnD) web design has been widely used by Elearning systems. However, it may take a lot of effort for web developers who have limited knowledge of web accessibility to build complex keyboard accessible DnD components. In this demo, we present our conceptual design of keyboard accessible DnD, and explain how web developers can leverage the design to implement their own pages. We further discuss how to extend this design to enable different DnD scenarios.