Thoroughly scraping is challenging, especially in an environment where you don’t have (or want) a JavaScript runtime.

For content extraction, I found the approach the Postlight library takes quite neat. It scores individual html nodes based on some heuristics (text length, link density, css classes). It the selects the nodes with the highest score. [1] I ported it to Swift for a personal read later app.

[1] https://github.com/postlight/parser