Not only is the definition of pixel unexpected, but 1in is now defined to be 96px in CSS 2.1, because this was the default in Windows for so many years. In retrospect, given whole page zoom from Opera and high-resolution displays from Apple, probably CSS shouldn't have had units named "in" and "px" at all but instead should have had a single unit like SVG.
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Not only is the definition of pixel unexpected, but 1in is now defined to be 96px in CSS 2.1, because this was the default in Windows for so many years. In retrospect, given whole page zoom from Opera and high-resolution displays from Apple, probably CSS shouldn't have had units named "in" and "px" at all but instead should have had a single unit like SVG.