csslint

Lint a single CSS file

$ csslint [file.css]

$ csslint [file1.css file2.css ...]

$ csslint --list-rules

$ csslint --errors=[errors,universal-selector,imports] [file.css]

$ csslint --warnings=[box-sizing,selector-max,floats] [file.css]

$ csslint --ignore=[ids,rules-count,shorthand] [file.css]

csslint [options] file.css [file2.css ...]

--errors
    Show only errors, hiding warnings.

--warnings
    Show only warnings, hiding errors.

--quiet
    Suppress all output except for the final report.

--version
    Display the version number and exit.

--config file
    Specify a configuration file to use.

--list-rules
    List all available rules.

--format format
    Specify the output format (e.g., text, compact, json).

csslint is a command-line tool and library designed to identify potential problems in CSS code.
It helps developers write more maintainable and efficient stylesheets by enforcing a set of coding conventions and best practices. csslint parses CSS files and analyzes them for issues related to syntax, performance, accessibility, and compatibility. It's a valuable asset for any front-end developer striving for high-quality CSS code. Using csslint, developers can catch errors early in the development process, reduce the likelihood of browser compatibility issues, and improve the overall performance of their web applications. The tool is highly customizable, allowing users to configure which rules are enforced and the severity of the reported errors.
This customization makes it adaptable to various project requirements and coding style preferences.

csslint relies on parsing CSS code and may not always accurately identify all potential issues. Results should be reviewed in context.

csslint can be configured using a .csslintrc file. This file allows you to specify which rules to enable or disable and configure their severity levels. The config file should be a JSON file. It allows to override global settings and define project specific linting rules. It's commonly placed in the project's root directory.

csslint supports different severity levels for rules: error and warning. Errors indicate more serious problems that should be addressed, while warnings suggest potential issues that may or may not be problematic.

csslint was initially developed to address the need for a dedicated tool to check the quality of CSS code. It has evolved over time with contributions from the open-source community. Usage has increased with the growing complexity of CSS and the adoption of best practices in web development.

eslint(1), stylelint(1)