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Re: [csswg-drafts] [css-fonts] Proposal to extend CSS font-optical-sizing (#4430)

From: John Hudson via GitHub <sysbot+gh@w3.org>
Date: Tue, 22 Oct 2019 15:32:15 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-545020579-1571758334-sysbot+gh@w3.org>
Hi Miles,

> So, if someone was trying to achieve a measurement of 1 typographical point = 1/72 inches (not CSS inches!) on macOS or iOS, the correct way to achieve that would be use a value of one Cocoa point, and the way of representing one Cocoa point in every browser on macOS & iOS is to use 1 CSS pixel.

Isn't this where it falls apart? You've defined a Cocoa point at =1/72 inch, but a CSS pixel is defined as 1/96 inch. So treating on typographic point as - one Cocoa point but using one CSS pixel to represent one Cocoa point is going to mess up the sizing of anything specified in typographic points.

I'm almost afraid to ask what a 'CSS inch' is. Are you referring to the fact that at lower resolutions there is rounding in display of absolute measurements? Otherwise a CSS inch is the same as a standard inch, no?

[The whole question of how best to implement resolution- and other device-dependent adjustments in OT variations design space is something most people are praying will go away. It may yet need to be better addressed.]

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GitHub Notification of comment by tiroj
Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/4430#issuecomment-545020579 using your GitHub account
Received on Tuesday, 22 October 2019 15:32:17 UTC

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