Package atom provides integer codes (also known as atoms) for a fixed set of frequently occurring HTML strings: tag names and attribute keys such as "p" and "id".

Package charset provides common text encodings for HTML documents.

EscapeString escapes special characters like "<" to become "&lt;".

NewTokenizer returns a new HTML Tokenizer for the given Reader.

NewTokenizerFragment returns a new HTML Tokenizer for the given Reader, for tokenizing an existing element's InnerHTML fragment.

UnescapeString unescapes entities like "&lt;" to become "<".

A CommentToken looks like <!--x-->.

A DoctypeToken looks like <!DOCTYPE x>.

An EndTagToken looks like </a>.

ErrorToken means that an error occurred during tokenization.

A SelfClosingTagToken tag looks like <br/>.

A StartTagToken looks like <a>.

TextToken means a text node.

ErrBufferExceeded means that the buffering limit was exceeded.

An Attribute is an attribute namespace-key-value triple.

A Token consists of a TokenType and some Data (tag name for start and end tags, content for text, comments and doctypes).

A Tokenizer returns a stream of HTML Tokens.

A TokenType is the type of a Token.