Intent to Implement and Ship: CSS property font-optical-sizing
Dominik Röttsches
Contact emails
Spec
https://drafts.csswg.org/css-fonts-4/#font-optical-sizing-def
No TAG review, as part of existing CSS fonts spec, implemented already by 2 other browsers.
Summary
The font-optical-sizing property automatically sets the font-size to the opsz - optical sizing axis of variable fonts that support optical sizing. This helps to improve styling and legibility of fonts depending on font size, because the font chooses a glyph shape that works optimally at the given font size. For example, the glyph contrast is improved in fonts in heading size vs. body text size. See the spec link for an illustration of what optical sizing is.
Is this feature supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes .
Debuggability
As a regular CSS property it will be supported in DevTools.
Risks
Interoperability and Compatibility
This is an already established features in 3 other browsers. As a default-on CSS property with values auto and none, it automatically improves font display for fonts that support it, while the none value allows suppressing activation.
Edge: Shipped
Firefox: Shipped
Safari: Shipped
Web / Framework developers: Feedback from fonts-on-the-web advocates such as Jason Pamental indicates that this is a desired feature.
Ergonomics
I see no issue with ergonomics, as it's a default on feature that works out of the box with a font that supports it.
Activation
It only works with fonts that support it, but otherwise does nothing - so there is no harm. Knowledge about the feature helps to request and specifically look for fonts with support when talking to a font vendor.
Is this feature fully tested by web-platform-tests? Link to test suite results from wpt.fyi.
WPT test cases are ready and will be upstreamed during implementation.
Entry on the feature dashboard
https://www.chromestatus.com/feature/5685958032752640
Yoav Weiss
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Daniel Bratell
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Chris Harrelson
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