Conditional text
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Conditional text is content with in a document that is meant to appear in some renditions of the document, but not other renditions.
For example, a writer can produce Macintosh and Windows versions of the same software manual by marking Macintosh-specific content as "Macintosh only" and Windows-specific content as "Windows only." Everything that is not marked for one platform or the other appears in the manuals for both platforms.