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Don't all browsers cache ( common, like jQuery) js and css stuff locally?

Most browsers changed that to a site-based cache instead of a global one.

They might cache it if the server allows them to cache it.

But evil servers don't.

Example: gravatar.com gives an expiration time of 5 minutes.

expires: Fri, 12 Feb 2021 11:54:40 GMT

I suspected it, thanks for confirming. What about fonts.googleapis.com, is it cached client side?