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doc/md053.md

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+# MD053 - Link and image reference definitions should be needed
+
+Tags: images, links
+
+Aliases: link-image-reference-definitions
+
+Parameters:
+
+* `ignored_definitions`: Ignored definitions (`string[]`, default `["//"]`)
+
+Fixable: Most violations can be fixed by tooling
+
+Links and images in Markdown can provide the link destination or image source
+at the time of use or can define it elsewhere and use a label for reference.
+The reference format is convenient for keeping paragraph text clutter-free
+and makes it easy to reuse the same URL in multiple places.
+
+Because link and image reference definitions are located separately from
+where they are used, there are two scenarios where a definition can be
+unnecessary:
+
+1. If a label is not referenced by any link or image in a document, that
+   definition is unused and can be deleted.
+1. If a label is defined multiple times in a document, the first definition is
+   used and the others can be deleted.
+
+This rule considers a reference definition to be used if any link or image
+reference has the corresponding label. The "full", "collapsed", and "shortcut"
+formats are all supported.
+
+If there are reference definitions that are deliberately unreferenced, they can
+be ignored by setting the `ignored_definitions` parameter. The default value of
+this parameter ignores the following convention for adding non-HTML comments to
+Markdown:
+
+```md
+[//]: # (This behaves like a comment)
+```