This guide is intended for those who wish to:

• Contribute code to CSS Lint
• Create their own rules for CSS Lint
• Customize a build of CSS Lint

In order to work with CSS Lint as a developer, it's recommended that:

• You know JavaScript, since CSS Lint is written in JavaScript.
• You're comfortable with command-line programs.
• You understand unit tests and why they're important.

If that sounds like you, then continue reading to get started.

Section 1: Get the Source Code

Before you can get started, you'll need to get a copy of the CSS Lint source code. This section explains how to do that and a little about the source code structure.

Section 2: Learn the Build System

CSS Lint uses a build system to make maintaining and testing the code easier. You'll need to learn the build system in order to verify your changes work.

Section 3: Run the Unit Tests

There are a lot of unit tests included with CSS Lint to make sure that we're keeping on top of code quality. This section explains how to run the unit tests.

Section 4: Working with Rules

You're finally ready to start working with rules. You may want to fix an existing rule or create a new one. This section explains how to do all of that.

Section 5: Contributing

Once you've made changes that you want to share with the community, the next step is to submit those changes back via a pull request.