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OOjs UI is a modern JavaScript UI toolkit for browsers. It provides a library of common widgets, layouts and windows that are ready to use, as well as many foundational classes for constructing custom user interfaces. The library was originally created for use by VisualEditor, which uses it for its entire user interface, and is now completely independent, and more useful and convenient for other use cases.

Quick start

This library is available as an npm package! Install it right away:

npm install oojs-ui

If you don't want to use npm, you can:

  1. Clone the repo and move into it, $ git clone oojs-ui && cd oojs-ui.
  1. Install Grunt command-line utility:
    $ npm install -g grunt-cli
  1. Install composer and make sure running composer will execute it (e.g. add it to $PATH in POSIX environments).
  1. Install dev dependencies:
    $ npm install
  1. Build the library (you can alternatively use grunt quick-build if you don't need to rebuild the PNGs):
    $ grunt build
  1. You can now copy the distribution files from the dist directory into your project.
  1. You can see a suite of demos in /demos by executing:
    $ npm run-script demos

Loading the library

While the distribution directory is chock-full of files, you will normally only need to load three:

  • oojs-ui.js, containing the full library
  • One of oojs-ui-apex.css or oojs-ui-mediawiki.css, containing theme-specific styles
  • One of oojs-ui-apex.js or oojs-ui-mediawiki.js, containing theme-specific code

You can load additional icon packs from files named oojs-ui-apex-icons-*.css or oojs-ui-mediawiki-icons-*.css.

The remaining files make it possible to load only parts of the whole library.

Furthermore, every CSS file has a right-to-left (RTL) version available, to be used on pages using right-to-left languages if your environment doesn't automatically flip them as needed.


We use the Semantic Versioning guidelines as much as possible.

Releases will be numbered in the following format:


For more information on SemVer, please visit

Issue tracker

Found a bug or missing feature? Please report it in the issue tracker!


We are always delighted when people contribute patches. We recommend a few things to make it quicker and easier for you to contribute:

  • You will need a wikitech account which you can use to login to gerrit, our code review system.
  • You will need a Wikimedia account, which you can use to login to Phabricator.
  • You should create a Phabricator ticket describing the issue you wish to change.
  • We automatically lint and style-check changes to JavaScript, PHP, CSS, Ruby and JSON files. You can test these yourself with npm test and composer test locally before pushing changes. SVG files should be squashed in advance of committing with SVGO using svgo --pretty --disable=removeXMLProcInst --disable=cleanupIDs <filename>.
  • To submit your patch, follow the "getting started" quick-guide. You should expect to get code review within a day or two.
  • A new version of the library is cut and released most weeks on Tuesdays.


Release process:

$ cd path/to/oojs-ui/
$ git remote update
$ git checkout -B release -t origin/master

Ensure tests pass

$ npm install && composer update && npm test && composer test

Avoid using "npm version patch" because that creates

both a commit and a tag, and we shouldn't tag until after

the commit is merged.

Update release notes

Copy the resulting list into a new section at the top of and edit

into five sub-sections, in order:

* Breaking changes

* Deprecations

* Features

* Styles

* Code

$ git log –format='* s (aN)' –no-merges –reverse v$(node -e 'console.log(require("./package.json").version);')...HEAD | grep -v "Localisation updates from" | sort
$ edit

Update the version number

$ edit package.json
$ git add -p
$ git commit -m "Tag vX.X.X"
$ git review

After merging:

$ git remote update
$ git checkout origin/master
$ git tag "vX.X.X"
$ npm run publish-build && git push –tags
$ npm publish