| errors | Package errors implements functions to manipulate errors. |
| github.com/andybalholm/cascadia | |
| golang.org/x/net/html | Package html implements an HTML5-compliant tokenizer and parser. |
| io | Package io provides basic interfaces to I/O primitives. |
| iter | Package iter provides basic definitions and operations related to iterators over sequences. |
| net/http | Package http provides HTTP client and server implementations. |
| net/url | Package url parses URLs and implements query escaping. |
| regexp | Package regexp implements regular expression search. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |