css/csso
Csso
csso is a CSS minifier and optimizer that reduces stylesheet file sizes through structural analysis and algebraic transformations. It functions as an abstract syntax tree processor, converting styles into a structured tree to perform deep analysis and semantic-preserving code transformations while maintaining the original visual presentation.
The project distinguishes itself through usage-aware optimization, analyzing external HTML markup and class identifiers to prune unused styles and reorganize rules based on actual document usage. It also performs structural refactoring by identifying and merging redundant selectors and declarations.
Additional capabilities include the normalization of property values and the minification of isolated inline style blocks. To support debugging of compressed production assets, the tool generates source maps that trace optimized code back to the original source files.
This utility is designed for integration into frontend build pipelines to automate the compression of CSS assets.
Features
- CSS Minification - Reduces the size of stylesheets by removing redundant code and whitespace through structural minification.
- CSS Minifiers - Reduces the size of CSS files by removing whitespace, comments, and merging redundant rules.
- CSS Usage Analyzers - Analyzes HTML markup and class identifiers to prune unused CSS rules and reorganize styles based on actual usage.
- CSS AST Transformations - Performs programmatic modification of CSS structures using tree traversal techniques for optimization.
- CSS AST Analysis - Performs deep structural analysis of CSS stylesheets using abstract syntax trees to enable algebraic manipulation.
- CSS AST Parsers - Converts stylesheets into a structured tree to perform deep analysis and semantic-preserving code transformations.
- Stylesheet Optimizations - Minifies stylesheets by removing whitespace and transforming semantic declarations within full files or blocks.
- CSS Optimizers - Implements tools to reduce the size and improve the overall efficiency of CSS stylesheets.
- CSS Structural Optimizations - Eliminates redundant code by merging declarations and rulesets through deep structural analysis.
- Rule Merging - Identifies and combines identical CSS rules and selectors through structural analysis to reduce file size.
- Property Value Normalization - Normalizes property values to achieve the most minimal character representation possible.
- CSS Source Map Generation - Generates mapping files that link compiled CSS output back to original source coordinates.
- Source Map Generators - Generates source maps that link compressed production CSS back to the original source files for debugging.
- Bundle-to-Source Mappings - Produces mappings that link compressed production bundles back to original source files for easier troubleshooting.
- Multi-Pass Compiler Pipelines - Uses a sequential multi-pass architecture to strip characters and reorganize CSS rules efficiently.
- Code Optimization Pipelines - Processes styles through modular optimization passes that ensure semantic integrity while reducing overall payload size.
- Syntax Tree Transformers - Implements a transformation system that modifies the CSS abstract syntax tree to optimize style rules.
- CSS Property Normalizers - Standardizes shorthand properties and unit values to reduce character count while preserving visual rendering.
- Inline Style Minifiers - Applies compression logic specifically to isolated inline style attributes and blocks to reduce total page payload.
- Asset Optimization - Minifies and structurally optimizes CSS files.
Star history
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