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What CSS file did the browser fetch? The one for screens less than 500px wide? Or the one for screens that are 504px wide?

There are a million ways to exfiltrate UI parameters through JS and CSS. It’s hard to both prevent that and still allow JS and responsive pages.

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just grab them all... not a huge deal, they are so small.

Okay. Those different css files all specify different images on the server, depending on the media query. Are we downloading all those images as well?

right... developers suck, overall ( I could not reply to the comment below because nyc would not let me)

It's more a case of the web being used in ways in which it wasn't really originally intended. Of course developers can implement things poorly and create problems (and often do) but demand for things like responsive sites is user-driven in my experience.

If you don't understand how the web works and actively dislike the community I don't understand why you keep commenting here.

it's all good my little monkey.... also tell me why most websites use files from 20 different domains if you understand the web so well....

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