At LeoDocs.leo#Leo's Documentation-->Users Guide-->Plugins-->@rst html\plugins.html-->Summary
The entry for viewrendered is duplicated:
``viewrendered.py``
Creates a window for *live* rendering of rst, html, etc.
to do the rendering, so installing docutils is recommended.
Supports @graphics-script, @image, @html, @movie and @svg nodes.
``viewrendered.py``
An alternate/enhanced version of viewrendered.py.
The second should read viewrendered2.py
Regards
Lewis