If what is being rendered is a block, content
is available, which will continue to iterate down the tree until it end and take the generated content of all the children and put it into the content
variable.
If it is an inline, text is available.
There always other variables available such as attr
.
This will complement the quick reference nicely. http://asciidoctor.org/docs/asciidoc-quick-reference/
Btw, if you want you can move this into the docs/ folder on a fork of asciidoctor.org to give it a real home.