Generate HTML Container Spec Doc from Text Source
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HTML generation requires kramdown [1], easily installed as a
rubygem [2].  Rubygems installation should satisfy dependencies
automatically.

[1]: http://kramdown.rubyforge.org/
[2]: http://rubygems.org/

HTML generation can then be done from the project root, like so:

$ kramdown doc/webp-container-spec.txt --template doc/template.html > doc/output/webp-container-spec.html