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What is "original" size?
Say you have a 300 pixel wide png, with 72 dpi, with "width: 3cm" in the css. And say we display it on a screen/device that's physically 96 dpi, but the software is set to 120dpi.
1. image pixel to screen pixel: so 300 screen pixels, 300@96 dpi = 7.9375 cm
2. obey png resolution: 300@72 dpi = 10.5833 cm, i.e. 400 screen pixels (400@96)
3. obey css: 3 cm, 113 screen pixels (113@96)
4. obey png resolution, but with "fake" screen resolution: 300@72 = 500@120, but since the screen is actually 96 dpi, that's 13.2292 cm (500@96)
5. obey css, but with "fake" screen resolution: 3 cm at 120 dpi = 142 screen pixels, 3.75 cm.
I guess you mean 1, but at least 2 and 4 could also be considered to be "original"
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