| bytes | Package bytes implements functions for the manipulation of byte slices. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/net/html | Package html implements an HTML5-compliant tokenizer and parser. |
| golang.org/x/text/encoding | Package encoding defines an interface for character encodings, such as Shift JIS and Windows 1252, that can convert to and from UTF-8. |
| golang.org/x/text/encoding/charmap | Package charmap provides simple character encodings such as IBM Code Page 437 and Windows 1252. |
| golang.org/x/text/encoding/htmlindex | Package htmlindex maps character set encoding names to Encodings as recommended by the W3C for use in HTML 5. |
| golang.org/x/text/transform | Package transform provides reader and writer wrappers that transform the bytes passing through as well as various transformations. |
| io | Package io provides basic interfaces to I/O primitives. |
| mime | Package mime implements parts of the MIME spec. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |