CSS Selector Usage Auditor | Free Online Tool

What is the CSS Selector Usage Auditor?

Compare CSS Selector with HTML fragments and list the rules that can be matched, not matched, and cannot be statically analyzed. ToolHub places the core computing entirely within the browser, allowing immediate use on both desktop and mobile devices, without the need to register an account or send content to the backend.

How to use this tool?

Enter the data according to the field prompts and select the required processing method.
Click "Process Now" to view the results, indicator summary and necessary error messages.
After confirming that the content meets actual needs, you can copy the results or download them into files for further use.

Suitable use cases

Remove suspected unused CSS, style splitting and component migration. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Interpretation of results and precautions

Dynamic Class, interactive state, pseudo-element and cross-page Selector may be misjudged. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Browser and device support

CSS Selector Usage Auditor supports current Chrome, Edge, Firefox, and Safari releases. Mobile and desktop layouts use the same validation rules documented on this page.

Frequently Asked Questions

Will the CSS Selector Usage Auditor upload data to the server?

No. Tool functions are executed directly within the current browser tab, and input and generated results will not be uploaded or saved by ToolHub.

What use cases is the CSS Selector usage inspector suitable for?

Remove suspected unused CSS, style splitting and component migration

Do I need to install software before using CSS Selector Usage Auditor?

No need. Use a desktop or mobile browser that supports modern JavaScript, and no account is required.

What are the limitations of this tool?

Dynamic Class, interactive state, pseudo-element and cross-page Selector may be misjudged.

Is manual inspection required after the results are generated?

Needed. Tools can assist with calculations, conversions, or formatting, but before going online, importing data, or making business decisions, the results should still be reviewed according to actual specifications.

CSS Selector Usage Auditor: inputs, output, and reproducible example

Use the free CSS Selector Usage Auditor online. Fast, private, mobile-friendly, and processed directly in your browser.

What this page actually processes

Field	Control	Default example	Validation role
HTML Content	Multiline text	`Input 1`	HTML Content is read by the browser as a multiline text value before the tool runs.
CSS Content	Multiline text	`.card { padding: 1rem; } .card.active h2 { color: blue; } .unused { display:none; }`	CSS Content is read by the browser as a multiline text value before the tool runs.

Reproduce the built-in example

Start with HTML Content = Input 1; CSS Content = .card { padding: 1rem; } .card.active h2 { color: blue; } .unused { display:none; }, then run CSS Selector Usage Auditor. Change one input at a time so the effect on the result remains traceable.

After validating html content, css content, the page displays its result in the output workspace and enables the relevant copy or download action.

When to use it and how to interpret the result

Limits and checks before use

Page verification record

Controls inspected2 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02