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

Some odd results. On Windows 10, Dell XPS 9560 15" 4k, display setting of font size 175%.

- Firefox 80.0a1 (2020-07-04) (64-bit) reports 0.2666 (=**26.66** on the opsz axis) as reported on MacOS by @lorp
- Chrome Version 86.0.4196.2 (Official Build) canary (64-bit) reports 0.5133  (=**51.33** on the opsz axis) 

I'm unable to explain the Chrome result.

I also tried on Android 10, Samsung Galaxy S9+

- Samsung Internet 12.1.1.5 beta (did not display the font correctly)

![samsung-internet-12 1 1 5beta](https://user-images.githubusercontent.com/2506926/86960653-da659180-c12d-11ea-818c-8b5239e979af.png)


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