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redroot/holmes
https://github.com/redroot/holmes
Holmes is stand-alone diagnostic CSS stylesheet that can highlight potentially invalid or erroneous HTML(5) markup by adding one class.
Added 13 years ago
Lunatech Labs - Front-end Patterns
http://www1.lunatech.com/~egor/fep/index.html
The first thing to point out is that this isn't a kitchen sink project like HTML5 Boilerplate. In fact it's not a template or widget library at all. FE-Patterns is a web stack pattern reference. These patterns are for you to tinker around with. Create your own HTML and use LESS files to style it.