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Links 1 through 10 of 10 by J. Albert Bowden II tagged zoom

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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. So to make a one-pixel line (better: looks like a one-pixel line) you have to write 2px. This preserves the visual size and adds a very smooth appearance – like we expect it from a Retina display. It also makes huge improvements for layouts on the iPhone 4 possible.

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