Anchor the AppleWebKit 15.4 antialias workaround UA match - #9265
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'15.4' matched anywhere in the UA, and every Chromium UA contains 'AppleWebKit', so unrelated version tokens (e.g. a Chrome build number or patch version) could force-disable antialiasing. Match the anchored Safari tokens Version/15.4 and OS 15_4 instead, which still cover desktop Safari 15.4/15.4.1 and all iOS 15.4 WebKit browsers. Fixes #9259. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Build size reportThis PR changes the size of the minified bundles.
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mvaligursky
approved these changes
Aug 31, 2026
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Description
The #4136 workaround matched
'15.4'anywhere in the UA, and every Chromium UA contains'AppleWebKit', so any unrelated15.4token (a Chrome build number, an OS patch version) could force-disable antialiasing on a non-Safari browser. The match is now anchored toVersion/15.4andOS 15_4, which still covers desktop Safari 15.4/15.4.1 and all iOS 15.4 WebKit browsers (including CriOS/FxiOS).Checked against eight real UA strings: the four affected Safari/WebKit 15.4 variants still trigger; Chrome 115.4.x builds and macOS Catalina (
10_15_4) no longer false-positive.Fixes #9259
Verified: lint clean; unit suite at the
mainbaseline (2337 passing).Checklist
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