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The reason is, that because every pixel is half the visual size, you may have to double the values of many CSS properties. For example text-shadow: 0 1px 0 #fff; which is like a half visual pixel on the iPhone 4.

If this is true, I'll be kind of pissed. I shouldn't need a special stylesheet for basic properties like border widths if the iPhone's browser is supposed to show the real web.