The World Wide Web has changed the way we search, access, consume and produce information. While existing superficial content allows us to browse and interact with the Web, we are far from taking full advantage of it. Laying beneath the surface of the Web there are a number of phenomena such as trends and patterns in information structure and in user behaviour that do shape the way we communicate, consume and browse. As far as accessibility is concerned, Web content plays a central role in an ecosystem where user agents, authoring tools, crowd-sourcing frameworks and testing tools determine how accessible is the Web. As these components are moving to the cloud, their mere activity and interplay produces large amounts of data. For instance, thousands of testing reports are being generated every day by automatic tools and auditors. Moreover, crowd-sourcing tools are facilitating a myriad of accessibility fixes and providing guidance to users.
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