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Preprocessors work on source text before it is broken down into its individual parts.
This is an excellent place to clean up bad characters or to extract portions for later
processing that the parser may otherwise choke on.
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Preprocessors are run after the text is broken into lines.
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Remove html blocks from the text and store them for later retrieval.
The raw HTML is stored in the [`htmlStash`][markdown.util.HtmlStash] of the
[`Markdown`][markdown.Markdown] instance.
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