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# Generate libwebp Container Spec Docs from Text Source
HTML generation requires [kramdown](https://kramdown.gettalong.org/), easily
installed as a [rubygem](https://rubygems.org/). Rubygems installation should
satisfy dependencies automatically.
HTML generation can then be done from the project root:
```shell
$ kramdown doc/webp-container-spec.txt --template doc/template.html > \
doc/output/webp-container-spec.html
```
kramdown can optionally syntax highlight code blocks, using
[CodeRay](https://github.com/rubychan/coderay), a dependency of kramdown that
rubygems will install automatically. The following will apply inline CSS
styling; an external stylesheet is not needed.
```shell
$ kramdown doc/webp-lossless-bitstream-spec.txt --template \
doc/template.html --coderay-css style --coderay-line-numbers ' ' \
--coderay-default-lang c > \
doc/output/webp-lossless-bitstream-spec.html
```
Optimally, use kramdown 0.13.7 or newer if syntax highlighting desired.
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