htmlunit cssparser

CSS parser used by HtmlUnit


HtmlUnit - CSSParser

This is the code repository of the CSS parser used by HtmlUnit starting with version 1.30.

For a long time HtmlUnit uses the CSSParser ( But as HtmlUnit has to support more
and more css related features a solution was required that offer more flexibility regarding the resulting object model.
This implementation starts based on CSSParser 0.9.25; we removed the sac dependency and did some cleanup.

We will try to stay in sync with CSSParser regarding the features in the future.

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Latest release Version 4.1.0 / April 28, 2024

Get it!


Add to your pom.xml:



Add to your build.gradle:

implementation group: 'org.htmlunit', name: 'htmlunit-cssparser', version: '4.1.0'

Latst CI build

The latest builds are available from our
Jenkins CI build server

Build Status

If you use maven please add:


You have to add the sonatype snapshot repository to your pom repositories section also:

    <id>OSS Sonatype snapshots</id>

Start HtmlUnit - CSSParser Development

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.


You simply only need a local maven installation.


Create a local clone of the repository and you are ready to start.

Open a command line window from the root folder of the project and call

mvn compile

Running the tests

mvn test


Pull Requests and and all other Community Contributions are essential for open source software.
Every contribution - from bug reports to feature requests, typos to full new features - are greatly appreciated.

Deployment and Versioning

This part is intended for committer who are packaging a release.

  • Check all your files are checked in
  • Execute these mvn to be sure all tests are passing and everything is up to data
   mvn versions:display-plugin-updates
   mvn versions:display-dependency-updates
   mvn -U clean test
  • Update the version number in pom.xml and

  • Commit the changes

  • Build and deploy the artifacts

   mvn -up clean deploy
  • Go to Sonatype staging repositories and process the deploy

    • select the repository and close it - wait until the close is processed
    • release the package and wait until it is processed
  • Create the version on Github

    • login to Github and open project
    • click Releases > Draft new release
    • fill the tag and title field with the release number (e.g. 4.0.0)
    • append
      • htmlunit-cssparser-4.x.x.jar
      • htmlunit-cssparser-4.x.x.jar.asc
      • htmlunit-cssparser-4.x.x-javadoc.jar
      • htmlunit-cssparser-4.x.x-javadoc.jar.asc
    • and publish the release
  • Update the version number in pom.xml to start next snapshot development

  • Update the htmlunit pom to use the new release


  • RBRi
  • all the contributors to CSSParser


This project is licensed under the Apache 2.0 License


Many thanks to all of you contributing to HtmlUnit/CSSParser/Rhino in the past.