Tip
This is an example using screenshot plugin for gradle-asciidoctor

Process

Go to the Gist AsciiDoctor main page at http://gist.asciidoctor.org/

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Figure 1. The main page

Then enter a Gist number that point to a file written in asciidoctor. For instance 9a8d3f1d32a8f0656a42 as for https://gist.github.com/mojavelinux/9a8d3f1d32a8f0656a42

gist
Figure 2. Awesome gist example // by mojavelinux

when you validate you get the result

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Figure 3. That’s it