The Pencil, Eraser, Bucket Fill and Picker are all indispensable when it comes to producing textual art. Because it's all just text, it can be easily embedded almost anywhere. Which versions include the command line tool?
Anatomy of an attribue entry to unset an attribute :! An attribute reference is an inline element composed of the name of the attribute enclosed in curly brackets.
Specify border or a background with just a few clicks.
Of course — you can download it from here. This loads the extensions but does not register it in the Asciidoctor extension registry.