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27 lines
947 B
Markdown
27 lines
947 B
Markdown
Links and images in Markdown can provide the link destination or image source
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at the time of use or can define it elsewhere and use a label for reference.
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The reference format is convenient for keeping paragraph text clutter-free
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and makes it easy to reuse the same URL in multiple places.
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There are three kinds of reference links and images:
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```markdown
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Full: [text][label]
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Collapsed: [label][]
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Shortcut: [label]
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Full: ![text][image]
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Collapsed: ![image][]
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Shortcut: ![image]
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[label]: https://example.com/label
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[image]: https://example.com/image
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```
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A link or image renders correctly when a corresponding label is defined, but
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the text displays with brackets if the label is not present. This rule warns
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of undefined labels for "full" and "collapsed" reference syntax.
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> "Shortcut" syntax is ambiguous and a missing label will not generate an
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error. For example, `[shortcut]` could be a shortcut link or the text
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"shortcut" in brackets.
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