- From: Myles C. Maxfield via GitHub <sysbot+gh@w3.org>
- Date: Tue, 29 Oct 2019 16:23:12 +0000
- To: public-css-archive@w3.org
@robmck-ms
> I'd been assuming that the term 'typographic points' you'd used referred to physical points. E.g. if I put a typographer's ruler on the screen
No. There are 3 distinct coordinate systems here:
1. CSS Units
2. OS / Typographical Units
3. Physical Units (as measured with a ruler)
The conversion between 1 and 2 is arbitrary, and browser features ("layout zoom") have even been built on top of this arbitrary conversion.
The conversion between 2 and 3 is arbitrary, because manufacturing processes are physical, constrained phenomena.
Optical sizing occurs in the 2nd coordinate system, because it A) has to match the rest of the system. I make no claims about anything that happens in the 3rd coordinate system.
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Received on Tuesday, 29 October 2019 16:23:14 UTC