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I don't recall any web browsers scaling images or other UI elements based on that, though. Everything assumed 72 or 96 DPI (depending on Mac or Windows), or just showed images at a 1:1 pixel ratio.

The widespread idea of actually serving different images to devices with different DPIs is fairly new.

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we’re right in the transition period of switching to higher pixel density devices, until we completely switch over to infinite scalable graphics with small file sizes only it will still take some time, but maybe not too long :) and in the very near future we may focus on hi-res graphics only without the need to worry about standard-resolution images anymore.

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