Servo is a prototype web browser engine written in the Rust language. It is currently developed on 64-bit macOS, 64-bit Linux, 64-bit Windows, and Android.
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Contributing to Servo

Servo welcomes contribution from everyone. Here are the guidelines if you are thinking of helping us:


Contributions to Servo or its dependencies should be made in the form of GitHub pull requests. Each pull request will be reviewed by a core contributor (someone with permission to land patches) and either landed in the main tree or given feedback for changes that would be required. All contributions should follow this format, even those from core contributors.

Should you wish to work on an issue, please claim it first by commenting on the GitHub issue that you want to work on it. This is to prevent duplicated efforts from contributors on the same issue.

Head over to Servo Starters to find good tasks to start with. If you come across words or jargon that do not make sense, please check the glossary first. If there’s no matching entry, please make a pull request to add one with the content TODO so we can correct that!

See for more information on how to start working on Servo.

Pull Request Checklist

  • Branch from the master branch and, if needed, rebase to the current master branch before submitting your pull request. If it doesn’t merge cleanly with master you may be asked to rebase your changes.

  • Commits should be as small as possible, while ensuring that each commit is correct independently (i.e., each commit should compile and pass tests).

  • If your patch is not getting reviewed or you need a specific person to review it, you can @-reply a reviewer asking for a review in the pull request or a comment, or you can ask for a review in the Servo room on Mozilla’s Matrix network.

  • Add tests relevant to the fixed bug or new feature. For a DOM change this will usually be a web platform test; for layout, a reftest. See our testing guide for more information.

For specific git instructions, see GitHub workflow 101.


In all Servo-related forums, we follow the Rust Code of Conduct. For escalation or moderation issues, please contact Josh ( and Lars ( instead of the Rust moderation team.


Servo contributors frequent the Servo room on Mozilla Matrix.

You can also join the dev-servo mailing list.