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DevDocs is a Chrome app which enables offline documentation browsing for many web and other development technologies.

The app has support for C, C++, CoffeeScript, CSS, DOM, Git, HTML, HTTP headers and status codes, JavaScript, jQuery, Markdown, PHP, Python, React, Ruby, SVG and more (there are 190 virtual manuals in total).

All the available documentations are listed in a left-hand sidebar. Click "Select documentation" bottom-left, check the boxes next to anything you need, click Save and the new technologies are collected together at the top of the sidebar.

You can browse them much like any other web-based manual. Expand something like HTTP, select an interesting section such as Response Status Codes and click a code to find out what it means. Or just use the fuzzy search feature to find all potential matches.

Initially you're browsing web content on devdocs.io, but an Offline feature enable downloading some or all of the sections. The app warns you of the space each one will take, although it probably won't be a concern. We grabbed CSS, DOM, DOM Events, HTML, HTTP and JavaScript, and the full set only required around 43MB.

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DevDocs is easy to use and brings most of the documentation you need into one place. There are some omissions, though - no Java? - and with no updates since May 2016 these gaps may not be filled any time soon.