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There is CSS media query for exactly your use-case. No need for sniffing, round-trips or any server-side activity at all.





a media query will not tell me what OS it is so i can infer the metrics of native fonts and form controls. i would have to use JS and create sentinel elements to make the measurements, which would still be a form of slower, shittier sniffing.

also, a media query or any other client side method prevents me from delivering exactly the final content that's necessary and not have to do additional reflow-inducing js to get the end result.




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