The documentation at Mozilla online is great, but sometimes I don’t have an internet connection, and the link in the final y'script o'reilly guide is also great, but you don’t have a convenient search option.
I'm just wondering if there is anything for javascript like railsapi or yard or jQAPI
http://devdocs.io Searchable stand-alone documentation for JavaScript, DOM Events, HTML, CSS
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Heronotes provides you with many standalone versions of good api documentation, including HTML, CSS, jQuery, Ruby, Prototype, etc.
All the best :)