Where can i find the documentation for webpack 3?

As this issue is still unresolved, I tried fetching site snapshots from https://web.archive.org and found my version at

https://web.archive.org/web/20180216190554/https://webpack.js.org/concepts/

Though bit slow but worth trying.

You can download the v.3.11.0 here

It is from the old Docs and Guides from Webpacks GitHub Repo.

https://github.com/webpack/webpack.js.org/releases/tag/v3.11.0

Navigate to src > content > guides

All .md files. Hope I could help you out :)

EDIT: Community hosted: https://webpack-v3.netlify.com/ (not mine)

Currently there is only one set of documentation and the webpack team aims to indicate in the documentation when there are differences between version 3 and 4.

Edit 4/2019: copies of the V3 doc have been set up here and here now by members of the community. The individual .md files can be found in this folder (and its subfolders) on github.

Edit 4/2020: Now the site carries the webpack 5 beta documentation. V4 documentation is here.

As mentioned on the issue tracker of webpack, GitHub user bendtherules was so nice to host the webpack v3 doc on an extra website: https://webpack-v3.jsx.app/