Best practice code examples

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For contributors or users of the system, it would probably be nice with a couple of examples of how to structure your code. It could also make a sane default for making code reviews and keeping the code consistent.

On the top of my head:

• handlebars example - should you reuse an existing pattern or create a new?
• css example - use variables, BEM and namespace to keep it solid
• js example - when do you need to add comments? Usage example?
• data