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◊url[1]{https://google.com}
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The @code{url} tag for a given identifier may be placed anywhere in the document, even before it is
referenced. If you create a @code{link} for an identifier that has no corresponding @code{url},
a @code{"Missing reference: [link-id]"} message will be substituted for the URL. Conversely,
creating a @code{url} that is never referenced will produce no output and no warnings or errors.
@deftogether[(@defproc[(figure [image-file string?] [caption xexpr?] ...) txexpr?]
@defproc[(figure-@2x [image-file string?] [caption xexpr?] ...) txexpr?])]
Insert a block-level image. The @racket[_image-file] should be supplied as a filename only, with no
folder names. It is assumed that the image is located inside an @racket[images-folder] within the
same folder as the source document.
For web output, using @racket[figure-@2x] will produce an image hard-coded to display at half its
actual size, or the width of the text block, whichever is smaller.
@deftogether[(@defproc[(fn [fn-id stringish?]) txexpr?]
@defproc[(fndef [fn-id stringish?] [elements xexpr?] ...) txexpr?])]
As with hyperlinks, footnotes are specified reference-style. In the output, footnotes will be
numbered according to the order in which their identifiers are referenced in the source document.
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