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This is collection of testing pages, that are used by wiki editors and authors to test layout, or anything else that is not considered complete article presentable to the public.
Although we use FlaggedRevs as quality asurance supporting feature, authors often need place where they can write just a piece of text to see how it will look in a final version. Default such place is Sandbox and there is one for each namespace. The rationale behind this is that different namespaces have different basic features, as well as enabled different extensions, so to be able to test certain layout editors need Sandbox that will behave like article written for that namespace.