The base URI is the URI of the document this purified HTML will be inserted into. This information is important if HTML Purifier needs to calculate absolute URIs from relative URIs, such as when %URI.MakeAbsolute is on. You may use a non-absolute URI for this value, but behavior may vary (%URI.MakeAbsolute deals nicely with both absolute and relative paths, but forwards-compatibility is not guaranteed). Warning: If set, the scheme on this URI overrides the one specified by %URI.DefaultScheme.
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