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My 24" screen is probably further from my face than my 15" screen used to be (not least because the 15" screen almost completely covered my desk by itself).

Not in CSS, 1pt is always x pixels regardless of how many DPI you have.

Nope, it's way more complicated than that. Device pixels, CSS pixels, a pixel is not a pixel. PPK on the subject:

http://fronteers.nl/congres/2012/sessions/a-pixel-is-not-a-p...

Points are a terrible unit for specifying font sizes for the screen. Use px or proportional units (em, percentages, etc.). Points are for print, not screen.

Yeah using pt works too. The problem is that everyone uses 12px in their CSS rather than 12pt.

See http://news.ycombinator.com/item?id=5268526