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-# Primer CSS Development
-
-If you've made it this far, **thank you**! We appreciate your contribution, and hope that this document helps you along the way. If you have any questions or problems, don't hesitate to [file an issue](https://github.com/primer/css/issues/new).
-
-## Structure
-Primer CSS is published to [npm] as [@primer/css]. Each of Primer CSS's "modules" lives in a subfolder under `src/` with an `index.scss` in it. Generally speaking, the styles are divided into three primary themes:
-
-* **Core** styles (in `core/`) are common dependencies, which include support variables, native element and typography styles, buttons, navigation, tooltips, etc.
-* **Product** styles (in `product/`) are specific to github.com, and include components such as avatars, labels, markdown styles, popovers, and progress indicators.
-* **Marketing** styles (in `marketing/`) are specific to GitHub marketing efforts, including international and event-focused sites as well as the more design-heavy feature pages on github.com. Marketing styles include new colors and button styles, and extend the core typography and whitespace scales.
-
-### Paths
-Here's what you need to know about how the files are structured in both git and in the published npm module:
-
-* In git, all of the SCSS source files live in the `src/` directory.
-* When published, all of the files in `src/` are "hoisted" to the package root so that you can import, say, utilities with:
-
-    ```scss
-    @import "@primer/css/utilities/index.scss";
-    ```
-
-* All bundle interdependencies within Primer CSS are defined as relative imports (e.g. with `../`), so everything should work fine as long as the `@primer/css` directory is in one of your Sass include paths (i.e. `node_modules`).
-
-
-## Workflow
-The typical Primer workflow looks something like this:
-
-1. `npm install` to install the development dependencies.
-1. [Start Storybook](#storybook)
-1. Navigate to the module you're working on and modify the SCSS and/or markdown files.
-1. Test your changes in Storybook.
-1. Push your work to a new branch.
-1. Request a review from one of the Primer "core" team members.
-
-## Install
-Run `npm install` to install the npm dependencies.
-
-## Docs site
-The Primer CSS docs are built with React using [Doctocat](https://primer.style/doctocat) and automatically deployed on every push to this repo with [Now]. You can run the server locally with:
-
-```sh
-npm start
-```
-
-Then visit http://localhost:8000 to view the site.
-
-### The docs directory
-The [docs directory](./docs/) contains all of the documentation files in our docs site. Files are nested in the `/content` folder.
-
-
-### URL tests
-We have a script that catches inadvertent URL changes caused by renaming or deleting Markdown docs:
-
-```sh
-npm run test-urls
-```
-
-This script includes some exceptions for URLs that have been intentionally moved or removed in the process of moving away from the [GitHub Style Guide](https://styleguide.github.com/primer/), and which you will need to modify if you rename or remove either Markdown docs or their `path` frontmatter. See [#641](https://github.com/primer/css/pull/641) for more information.
-
-## Storybook
-To borrow a [metaphor from Brad Frost](http://bradfrost.com/blog/post/the-workshop-and-the-storefront/), the [docs site](#docs-site) is Primer CSS's storefront, and [Storybook] is its workshop.
-
-Our Storybook setup allows you to view every HTML code block in Primer CSS's Markdown docs in isolation. To get started, run the Storybook server with:
-
-```sh
-npm run start-storybook
-```
-
-This should open up the site in your browser (if not, navigate to `http://localhost:8001`).
-
-### Code blocks
-All `html` fenced code blocks in `src/**/*.md` will be rendered as stories and listed under the relevant module's name in the left-hand nav. File changes should trigger a live reload automatically (after a brief delay).
-
-
-## Scripts
-Our [`package.json`](package.json) houses a collection of [run-scripts] that we use to maintain, test, build, and publish Primer CSS. Run `npm run <script>` with any of the following values for `<script>`:
-
-* `fresh` does a "fresh" npm install (like `npm install -f`)
-* `dist` runs `script/dist`, which creates CSS bundles of all the `index.scss` files in `src/`.
-* `check-links` runs a link checker on your local development server (`localhost:3000`, started with `npm start`).
-* `lint` lints both our SCSS and JavaScript source files.
-* `lint-css` lints our SCSS source files.
-* `lint-js` lints the JavaScript source files.
-* `now-build` and `now-start` are run on [Now] to build and start the docs site server. `now-test` runs them both in order.
-* `start` runs the documentation site locally (alias: `dev`).
-* `test-urls` compares a (pre-generated) list of paths from the **deprecated** [Primer Style Guide](https://styleguide.github.com/primer/) to files in `pages/css`, and lets us know if we've inadvertently deleted or renamed anything.
-* `test-migrate` tests the [`primer-migrate`](MIGRATING.md#primer-migrate) command line utility.
-
-The above list may not always be up-to-date. You can list all of the available scripts by calling `npm run` with no other arguments.
-
-
-[@primer/css]: https://www.npmjs.com/package/@primer/css
-[run-scripts]: https://docs.npmjs.com/cli/run-script
-[storybook]: https://storybook.js.org/
-[now]: https://zeit.co/now
-[npm]: https://www.npmjs.com/
-[npx]: https://www.npmjs.com/package/npx