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Post-processors run on the text of the entire document after is has been serialized into a string.
Postprocessors should be used to work with the text just before output. Usually, they are used add
back sections that were extracted in a preprocessor, fix up outgoing encodings, or wrap the whole
document.
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Postprocessora
Postprocessors are run after the ElementTree it converted back into text.
Each Postprocessor implements a `run` method that takes a pointer to a
text string, modifies it as necessary and returns a text string.
Postprocessors must extend `Postprocessor`.
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Subclasses of `Postprocessor` should implement a `run` method, which
takes the html document as a single text string and returns a
(possibly modified) string.
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