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changes of context major changes in the content of the Web page that, if made without user awareness, can disorient users who are not able to view the entire page simultaneously Opening a new window, moving focus to a different component, going to a new page (including anything that would look to a user as if they had moved to a new page) or significantly re-arranging the content of a page are examples of changes of context. — Web Content Accessibility Guidelines (WCAG) 2.1