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World Wide Web (Web) documents, once delivered in a form that remained constant whilst viewed, are now often dynamic with sections of a page able to change independently, either automatically or as a result of user interaction. In order to make these updates, and hence their host pages, accessible, it is necessary to detect when the update occurs and how it has changed the page, before determining how, when and what to present to the user. This can only be achieved with an understanding of bothdoi:10.1007/s10209-011-0251-y fatcat:cq7y6hhahjaatbwcyvfsunkfcm