CSS Selector Extractor | Online Free Tool | Elysia Tools

CSS Selector Extractor | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Development
Input types: textarea, checkbox
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The CSS Selector Extractor is a web-based tool that analyzes CSS content to extract and categorize all selectors, including classes, IDs, elements, and pseudo-classes. It helps developers audit stylesheet complexity, identify unused selectors, and generate documentation by providing detailed insights with options for specificity calculation and deduplication.

When to use

When auditing CSS files to assess complexity and improve maintainability.
When identifying and removing unused class names or selectors from stylesheets.
When generating reference documentation for CSS selectors in a development project.

How it works

1Paste your CSS content into the input textarea or upload a file.
2Configure options such as including media queries, keyframes, deduplication, and specificity calculation.
3Extract the selectors to receive a categorized JSON output with details like selector type, line number, and specificity score.

Use cases

Auditing stylesheet complexity to optimize performance and reduce file size.
Finding and cleaning up unused CSS selectors to streamline code.
Creating automated documentation for CSS classes and IDs in a project.

Examples

1. Audit Complex Stylesheet

Front-end Developer

Background

A developer is working on a legacy project with a large, minified CSS file that has grown unwieldy over time.

Problem

The file contains many selectors, and it's unclear which are redundant or overly specific, leading to maintenance issues.

How to use

Paste the minified CSS content into the tool, enable 'Deduplicate Results' and 'Calculate Specificity', then extract.

{ "includeMediaQueries": true, "includeKeyframes": true, "deduplicate": true, "calculateSpecificity": true }

Outcome

The tool outputs a JSON list of unique selectors with specificity scores, revealing duplicate rules and high-specificity selectors that can be refactored for better maintainability.

2. Generate Selector Documentation

Tech Lead

Background

A team is onboarding new developers and needs a quick reference for all CSS selectors used in the project's stylesheets.

Problem

There is no centralized documentation, making it hard for new members to understand the CSS structure.

How to use

FAQ

What CSS selector types are supported?

It supports class selectors, ID selectors, element selectors, attribute selectors, pseudo-classes, pseudo-elements, and combinators like descendant and adjacent siblings.

Can it process SCSS or LESS files?

Yes, it handles nested selectors from SCSS and LESS, extracting them as part of the analysis.

Does it remove duplicate selectors?

Yes, if the 'Deduplicate Results' option is enabled, it removes duplicate selectors from the output.

How is CSS specificity calculated?

Specificity is calculated based on CSS rules, providing a score for each selector to help understand precedence and conflicts.

Is the tool free to use?

Yes, the CSS Selector Extractor is free and requires no installation, running directly in your browser.