Techniques are disclosed for concurrent preparation of multiple versions of a website. Web page content can be branched in response to a request from a first user to create a working copy of one or more production web pages source documents. Any edits applied to the production version of the documents may be automatically applied to the working copy. Further, the working copy can be edited independently of the production version. The working copy can be promoted to production by replacing the production version with the edited working copy. Any number of separate working copies can be created and edited concurrently with the production version.