_mkbook_ nominally utilizes [CommonMark](https://commonmark.org/) with some [GFM](https://github.github.com/gfm/) extensions through the use of the [comrak](https://crates.io/crates/comrak) crate. In using _comrak_, a specific set of options are used, which are listed here:
```rust
let options: ComrakOptions = ComrakOptions {
hardbreaks: false,
smart: true,
github_pre_lang: false,
default_info_string: None,
unsafe_: true,
ext_strikethrough: true,
ext_tagfilter: false,
ext_table: true,
ext_autolink: true,
ext_tasklist: true,
ext_superscript: true,
ext_header_ids: Some("header".to_owned()),
ext_footnotes: true,
ext_description_lists: true,
..ComrakOptions::default()
};
```
Mostly, know that the following extensions are enabled: