A living style guide and documentation for GOV.UK Components
Ruby HTML CSS Shell
Latest commit 464e0ed Nov 15, 2016 @rubenarakelyan rubenarakelyan committed on GitHub Merge pull request #42 from alphagov/bump-slimmer-and-update-docs
Bump slimmer and update docs


GOV.UK Component Guide

Build Status

A living style guide and documentation for GOV.UK Components — A new approach to sharing UI patterns between applications without having to duplicate code.


It's still in it's early stages, many features are missing or incomplete, and documentation may not be 100% accurate.

It depends on Slimmer and makes API calls to Static.


It's a pretty standard Rails app, clone it, bundle it.


$ PLEK_SERVICE_STATIC_URI=assets.digital.cabinet-office.gov.uk ./startup.sh

If running on a VM, then Rails needs to be bound to rather than localhost so that it can be accessed outside of the VM. This is if using startup.sh but if running bundle exec rails s yourself you'll need to bind the port manually.

The application will start on port 3113, so to access it visit or dev.gov.uk:3113 on a VM.

The PLEK_SERVICE_STATIC_URI environment variable points to a public instance of alphagov/static - This is where the component documentation used to generate the dynamic parts of this guide is fetched from. Pointing at different static hosts may show different components.

Running against local static

If you'd like to run the component guide against a different version of static, for example, where you've added, or made changes to, components, you'll need to run a copy of static locally.

To get a local copy of alphagov/static, follow the installation and local running instructions there, then run the component guide with this command:



The app is deployed to a Heroku instance and is continuously deployed, updating whenever master changes and CI passes.

To access the Heroku admin, add yourself through the shared heroku@digital.cabinet-office.gov.uk account, or ask a contributor to add you.

Environment vars

These are required when running a production environment

  • GOVUK_APP_DOMAIN- set to www.gov.uk