Oh, I need to add 1 more thing: I think Purgecss only runs when the environment is "production". This is to prevent issues in development if you change CSS classes in your markup without regenerating your CSS.
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Purgecss is amazing. But do make sure you have it set up correctly to check source files. That's how it determines what classes you're using.
Depending on what tools you build with, you may also need to whitelist some selectors. That should be covered in the Purgecss docs.
Oh cool thanks for the heads up, will be ready for it.
Oh, I need to add 1 more thing: I think Purgecss only runs when the environment is "production". This is to prevent issues in development if you change CSS classes in your markup without regenerating your CSS.