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strip unused CSS

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Is there a way or online website that can crawl my website and create a new CSS of only classes dat are used?

I currently have CSS file (from themeforest) that contains a lot of unused CSS. I want to strip the unused CSS to create a smaller file.

Same also for the js files.

Any thoughts?

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you can use PurgeCss for this, you'll need to install postcss and follow some steps in order to make it function.
Take a look at this post, you can have an idea on how purgecss works, even if you are not interested in using tailwindcss.

I don't think there is something similar for javascript, rather than minification. You'll need to understand which elements rely on which js and then remove the useless parts by hand.

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