Absolute measurements (which no longer exist in CSS) are a sane approach to support different resolution displays that are all used at the same viewing distance.
Using absolute measurements to size things on a web page that is then viewed on a TV (viewing distance in the 5-15ft range), a tablet (viewing distance in the 1-2ft range), and an eyeglass HUD (viewing distance in the 1-3in range) would be a disaster.
The fact that people _were_ using inches and millimeters on the web and expecting them to somehow work across all these devices is why they're all now defined in terms of CSS reference pixels...
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Absolute measurements (which no longer exist in CSS) are a sane approach to support different resolution displays that are all used at the same viewing distance.
Using absolute measurements to size things on a web page that is then viewed on a TV (viewing distance in the 5-15ft range), a tablet (viewing distance in the 1-2ft range), and an eyeglass HUD (viewing distance in the 1-3in range) would be a disaster.
The fact that people _were_ using inches and millimeters on the web and expecting them to somehow work across all these devices is why they're all now defined in terms of CSS reference pixels...