PurifyCSS is a CSS unused style remover and payload optimizer that analyzes HTML and templates to identify and delete unused CSS selectors from stylesheets. It functions as a frontend build automation tool that integrates into development pipelines to automatically strip redundant styles and minify assets during the compilation phase.
The tool provides specific optimization for single page applications, identifying and removing redundant CSS while ensuring necessary styles are preserved across dynamic views and states.
The utility covers a range of capabilities including static content analysis, selector-based filtering, and the use of whitelists to prevent the deletion of protected style rules. It also includes a minifier to compress final stylesheets by removing unnecessary whitespace and characters.