Library, helping to isolate the most important thing in an html page?

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I.e. how does the addition of statuses in facebook. I just inserted the link, and he pulls the content and, together with the pictures. And works correctly, infection is the relevant paragraph of text and a picture to it, no logo, no banners. How does he know? Maybe it's in a thread of a popular library, and I missed?
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View the source code of the extension iReader, perhaps this is what you are looking for
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Getting the main content of web pages programmatically
\rhabrahabr.ru/blogs/i_am_advertising/105582/
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