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

From: Nick Sherman via GitHub <sysbot+gh@w3.org>
Date: Mon, 08 Jun 2020 15:50:22 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-640714381-1591631421-sysbot+gh@w3.org>
> I assume it would involved some trigonometry to calculate 1/72 inch?

Yes, this is exactly the kind of relative-size calculation @chrissam42 and I made [sizecalc.com](https://sizecalc.com) for.

> So, 4/3 px should theoretically already equal 3 arcminutes

That would be nice. However, the CSS spec [uses 28 inches](https://www.w3.org/TR/CSS22/syndata.html#img-pixel1) as the base viewing distance for its calculations, explicitly defining 1px as 0.0213 degrees (i.e. ~1.2789 arcminutes). As such, 4/3px only equals ~1.7052 arcminutes.

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Received on Monday, 8 June 2020 15:50:24 UTC

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