Superscript is not possible using markdown, This plugin adds a tag for GitBook to easily use superscripts.
Configure the plugin in your book.json
:
{
"plugins": ["superscript"]
}
Then in your markdown/asciidoc content:
Hello world. {% sup %}superscript text!{% endsup %}
And with a link. {% sup href="https://www.google.fr" %}4{% endsup %}
And with markdown. {% sup %}**4**{% endsup %}