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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: Fri, 18 Sep 2020 00:22:31 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-694571822-1600388550-sysbot+gh@w3.org>
> The proposal by @fantasai, simple px and pt keywords to avoid the media-sensitive recalibration initiated by Apple, is a very good step forward. I fully support it even if no other inheritable opsz scale adjustments become incorporated into CSS.

If I understand the proposal correctly, allowing authors to specify opsz in CSS as `px` or `pt` would create a new layer of scaling that browsers would then need to calculate in order to make an appropriate opsz selection based on the size of a CSS `px` or CSS `pt`—not a 1/72 physical inch point—: I think that's fine, so long as implementers don't get lazy and start assuming equivalences between units. I'm not sure that it really moves things forward without first fixing the auto behaviour, but as I said in our video call with Chris: I consider CSS options for adjusting opsz to be far downstream from what I or any other font maker should need to think about.

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