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postcss/autoprefixer

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Autoprefixer

Autoprefixer is a PostCSS plugin and browser compatibility tool that automatically manages vendor prefixes for CSS rules. It functions as an abstract syntax tree transformer that parses CSS to insert required prefixes and remove obsolete ones based on real-time compatibility data.

The project differentiates itself by providing a dedicated CSS Grid polyfill, which translates modern Grid syntax into legacy formats for older browser versions. It also allows for granular control through the use of inline CSS comments to selectively enable or disable prefixing for specific rules.

The system covers broad capability areas including browser targeting via configuration queries, automated stylesheet maintenance, and compatibility analysis. It provides diagnostic warnings for outdated syntax and detailed reports on the specific prefixes applied to the code.

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Features

  • Vendor Prefix Managers - Automatically inserts required browser-specific vendor prefixes into CSS rules based on compatibility data.
  • External Data Integrations - Integrates with external browser compatibility databases to determine necessary vendor prefixes in real-time.
  • AST Transformation Tools - Parses CSS into an abstract syntax tree to modify and clean vendor-specific properties.
  • AST Mutations - Implements CSS transformation by modifying the abstract syntax tree to inject or remove vendor prefixes.
  • Browser Compatibility Targets - Allows users to define the minimum browser versions supported through queries or configuration files.
  • Browser Version Resolution - Resolves supported browser versions by parsing configuration strings to filter required prefixes.
  • Plugin Architectures - Operates as a modular plugin within the PostCSS architecture to transform CSS parse trees.
  • Browser Compatibility & Utilities - Ensures stylesheets work across different web browsers by adding necessary vendor prefixes.
  • Cross-Browser CSS Authoring - Enables writing modern CSS once and automatically generating the browser-specific syntax needed for older versions.
  • Grid Polyfills - Translates modern CSS Grid syntax into compatible versions for older browsers, including autoplacement support.
  • Build Pipeline Integrations - Integrates into build pipelines as a PostCSS plugin to automate prefixing and compatibility checks.
  • Prefixing Control Comments - Provides granular control over prefixing using inline CSS comment markers to skip or force prefixes.
  • CSS Syntax Transpilation - Translates modern CSS Grid declarations into compatible legacy formats for older browser versions.
  • Inline Prefixing Controls - Supports the use of inline CSS comments to selectively enable or disable prefixing for specific rules.
  • Build and Transpilation Tools - PostCSS plugin to add vendor prefixes automatically.
  • Feature Summary: - Listed in the “Feature Summary:” section of the Livecodes awesome list.
22,257 stars·1,287 forks·JavaScript·MIT·24 views

Star history

Star history chart for postcss/autoprefixerStar history chart for postcss/autoprefixer

How this analysis was created: This summary and feature list are AI-generated from collected project material and can contain mistakes. Stars, license and language are imported from GitHub. Inclusion does not mean that we have tested or audited this project. Check the source documentation for any feature you depend on. Learn more on our About page.

Frequently asked questions

What does postcss/autoprefixer do?

Autoprefixer is a PostCSS plugin and browser compatibility tool that automatically manages vendor prefixes for CSS rules. It functions as an abstract syntax tree transformer that parses CSS to insert required prefixes and remove obsolete ones based on real-time compatibility data.

What are the main features of postcss/autoprefixer?

The main features of postcss/autoprefixer are: Vendor Prefix Managers, External Data Integrations, AST Transformation Tools, AST Mutations, Browser Compatibility Targets, Browser Version Resolution, Plugin Architectures, Browser Compatibility & Utilities.

Which projects share features with postcss/autoprefixer?

Projects with overlapping indexed features include: browserslist/browserslist — Browserslist is a browser target configuration tool and market share database. It provides a shared configuration… ai/browserslist — Browserslist is a browser compatibility configuration tool and a shared specification that synchronizes target browser… postcss/postcss — PostCSS is a CSS post-processor and abstract syntax tree transformation tool that parses stylesheets into a structured… parcel-bundler/lightningcss — Lightning CSS is a high-performance CSS toolchain implemented in Rust. It provides a comprehensive suite of tools for… babel/babel — Babel is a pluggable JavaScript compiler and transpiler that converts modern ECMAScript syntax into… khan/aphrodite — Aphrodite is a framework-agnostic CSS-in-JS styling library that allows styles to be defined using JavaScript objects.…

Projects sharing features with Autoprefixer

These projects share indexed features with Autoprefixer. Shared tags can include platform or build tooling; verify the primary use case before treating a result as a replacement.
  • browserslist/browserslistbrowserslist avatar

    browserslist/browserslist

    13,540View on GitHub↗

    Browserslist is a browser target configuration tool and market share database. It provides a shared configuration layer that synchronizes supported browser versions across various front-end development tools, such as JavaScript compilers and CSS autoprefixers, to determine necessary syntax transforms and polyfills. The project translates human-readable queries into specific lists of browser versions based on global and regional usage statistics. It allows for the integration of custom analytics data to override global market share and can generate regular expressions from target lists to dete

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  • ai/browserslistai avatar

    ai/browserslist

    13,541View on GitHub↗

    Browserslist is a browser compatibility configuration tool and a shared specification that synchronizes target browser versions across front-end build tools. It serves as a centralized system for defining browser support, ensuring consistency across CSS autoprefixers, JavaScript transpilers, and linting tools. The tool integrates browser usage analytics to determine target lists based on real-world traffic statistics and global usage data. It also functions as a user agent regex generator, converting browser version queries into regular expressions for matching and validating browser user age

    JavaScript
    View on GitHub↗13,541
  • postcss/postcsspostcss avatar

    postcss/postcss

    28,968View on GitHub↗

    PostCSS is a CSS post-processor and abstract syntax tree transformation tool that parses stylesheets into a structured tree for programmatic analysis and modification. It functions as a plugin-driven pipeline where JavaScript plugins can modify, insert, or delete nodes to transform styles. The project provides a framework for building a custom plugin ecosystem to extend the CSS language with non-standard features such as loops, conditionals, and shorthand properties. It supports multi-syntax parsing through pluggable parsers and stringifiers, allowing it to process various style formats and c

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  • parcel-bundler/lightningcssparcel-bundler avatar

    parcel-bundler/lightningcss

    7,581View on GitHub↗

    Lightning CSS is a high-performance CSS toolchain implemented in Rust. It provides a comprehensive suite of tools for stylesheet processing, including a bundler, minifier, module compiler, syntax lowerer, and vendor prefixer. The engine utilizes a browser-grade grammar for parsing and converts stylesheets into typed property values. It distinguishes itself through a visitor-based transformation API that allows for custom modifications of the parsed abstract syntax tree and an error-tolerant parsing mechanism that recovers from malformed syntax to prevent build failures. The toolset covers br

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