The reference definition printed to the document actually doesn’t show up anywhere in the rendered. We can put the definitions anywhere in the document, so when I type here in this paragraph (like CRAN), that text looks for the label created below to create a hyperlink. The md_reference() function is used to create the link reference definition only, which must then be paired with the same label elsewhere in the document. Link reference definitions can come either before or after the links that use them.
Instead, it defines a label which can be used in reference links and reference-style images elsewhere in the document. No further non-whitespace characters may occur on the line.Ī link reference definition does not correspond to a structural element of a document. Compare the following output to the one produced by md_indent().Ī link reference definition consists of a link label, indented up to three spaces, followed by a colon ( :), optional whitespace (including up to one line ending), a link destination, optional whitespace (including up to one line ending), and an optional link title, which if it is present must be separated from the link destination by whitespace.
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The man feature of md_fence() is the ability to specify the info string which defines the code language used to highlight syntax. However, this spec does not mandate any particular treatment of the info string. The first word of the info string is typically used to specify the language of the code sample, and rendered in the class attribute of the code tag. The content of a code fence is treated as literal text, not parsed as inlines. The content of the code block consists of all subsequent lines, until a closing code fence of the same type as the code block began with (backticks or tildes), and with at least as many backticks or tildes as the opening code fence…. The line with the opening code fence may optionally contain some text following the code fence this is trimmed of leading and trailing whitespace and called the info string… (Tildes and backticks cannot be mixed.) A fenced code block begins with a code fence, indented no more than three spaces…
A code fence is a sequence of at least three consecutive backtick characters … or tildes ( ~).
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