Rapidly inline your site's critical CSS.

Features

• Extremely fast — written in pure Rust for maximal performance
• Robust — uses HTML and CSS parsers from the Servo project
• Integrations with popular frameworks
• Supports preloading and/or inlining critical fonts
• Prunes unused CSS keyframes and media queries
• Minifies CSS using Parcel's lightningcss
• Supports pruning inlined CSS rules from lazy-loaded stylesheets

Usage

CLI

First, install the critters cli command globally:

cargo install critters-rs

Then, execute critters on a folder with your preferred options,

critters -p ./dist {options}

or view all the possible options:

critters -h

NodeJS API

See the documentation in the package's README.

Rust Crate

View the documentation for the Rust crate at https://docs.rs/critters-rs/.

Other Integrations

View the documentation for other integrations in their package READMEs:

• Astro

Acknowledgements

This project is heavily inspired by https://github.com/GoogleChromeLabs/critters, aiming to provide identical functionality while offering considerably improved performance. Much credit goes to the Google Chrome team for their work on the original library.

License

Apache 2.0