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.

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.

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.

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.

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.

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.