Contact emails
[email protected], [email protected]

Specification
https://drafts.csswg.org/css-font-loading/#font-face-set-check

Summary

The FontFaceSet's check() function verifies whether it's possible to 
display text using the specified fonts without attempting to utilize fonts 
in the FontFaceSet that have not completed loading. This allows users to 
safely employ the font without later triggering a font replacement (i.e., 
font swap).


*Motivation*While having a review [1] to fix issue 1416842 [2], I heard 
that an "Intent to ship" email is required since the fix changes Blink's 
behavior. The font loading API was updated, so we need to update our 
implementation in conformance with the spec.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/4913179
[2] https://crbug.com/1416842

Blink component
Blink>Fonts 
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EFonts>

Search tags
CSS <https://chromestatus.com/features#tags:CSS>, Font 
<https://chromestatus.com/features#tags:Font>, Loading 
<https://chromestatus.com/features#tags:Loading>, FontFaceSet 
<https://chromestatus.com/features#tags:FontFaceSet>, check 
<https://chromestatus.com/features#tags:check>

TAG review
None

TAG review status
Not applicable

Risks

Interoperability and Compatibility

The current behavior of Blink does neither follow the updated spec nor 
match other engines' behavior. This proposal aims at fixing it. 
https://github.com/w3c/csswg-drafts/issues/5744

*Gecko*: Shipped/Shipping (
https://bugzilla.mozilla.org/show_bug.cgi?id=1252821)

*WebKit*: Shipped/Shipping (https://bugs.webkit.org/show_bug.cgi?id=156035)

*Web developers*: No signals

*Other signals*:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that 
it has potentially high risk for Android WebView-based applications?

None

Debuggability

None

Will this feature be supported on all six Blink platforms (Windows, Mac, 
Linux, Chrome OS, Android, and Android WebView)?
Yes

Is this feature fully tested by web-platform-tests 
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

The following WPT tests cover this feature. * 
css/css-fonts/fallback-remote-to-data-url.html * 
css/css-fonts/fallback-url-to-local.html

Flag name on chrome://flags
None

Finch feature name
None

Non-finch justification
None

Requires code in //chrome?
False

Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1416842

Estimated milestones
Shipping on desktop
120
Shipping on Android
120
Shipping on WebView
120
Shipping on WebView
120

Anticipated spec changes

Open questions about a feature may be a source of future web compat or 
interop issues. Please list open issues (e.g. links to known github issues 
in the project for the feature specification) whose resolution may 
introduce web compat/interop risk (e.g., changing to naming or structure of 
the API in a non-backward-compatible way).
None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5174086494060544

This intent message was generated by Chrome Platform Status 
<https://chromestatus.com/>.

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