Re:The State of CSS 2019
by looeee on Monday June 17, 2019 @10:34AM
(#20203373)
I'm gonna guess that they have very little to do with inches in the real world, and will in fact display at different lengths on different screens.
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That's true, but that issue isn't specific to CSS inches. Pixels aren't pixels, points aren't points, etc.
It's not even an HTML/browser issue. There's a general problem with knowing in software the real-life physical size or length of something displayed on screen. The calibration information available isn't generally reliable, though I think people are paying more attention these days with the growing interest in AR.