How can I export only CSS used on a site? (Without: dustproof spider, firebug)

I created a project, and I want to export only the CSS that was used in the project or on the page. I tried spider vacuum cleaner and firebug, but these add-ons capture all the CSS of the project! I need to take only the CSS that was used and export it to another CSS file. Is there any program for this reason?

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Source: https://habr.com/ru/post/1524042/


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