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My hunch is that this is a typo and it should read "extract bits OF content."

I agree and having a missing word in your text often leads to confusion :)

Honestly you could drop the "bits" which is a bit redundant and use the phrase "Uses CSS selectors to extract content from HTML files."

Exactly this! I’ll fix it after work.

Maybe have the line about "jq" be 2nd. Have the first line be a brief description of what it actually does.