fix: escape FluentProvider SSR style selectors - #36464
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🕵🏾♀️ visual changes to review in the Visual Change Report
vr-tests-react-components/Menu 1 screenshots
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| vr-tests-react-components/Menu.Nested Submenus Small Viewport Flipped.nested menu.chromium.png | 670 | Changed |
vr-tests-react-components/Menu Converged - submenuIndicator slotted content 1 screenshots
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| vr-tests-react-components/Menu Converged - submenuIndicator slotted content.default.submenus open.chromium.png | 605 | Changed |
vr-tests-react-components/Portal 1 screenshots
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| vr-tests-react-components/Portal.Apply Class Names.should have green border.chromium.png | 15 | Changed |
vr-tests-react-components/Positioning 2 screenshots
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| vr-tests-react-components/Positioning.Positioning end.updated 2 times.chromium.png | 628 | Changed |
| vr-tests-react-components/Positioning.Positioning end.chromium.png | 949 | Changed |
vr-tests-react-components/ProgressBar converged 3 screenshots
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| vr-tests-react-components/ProgressBar converged.Indeterminate + thickness - Dark Mode.default.chromium.png | 2 | Changed |
| vr-tests-react-components/ProgressBar converged.Indeterminate + thickness - High Contrast.default.chromium.png | 47 | Changed |
| vr-tests-react-components/ProgressBar converged.Indeterminate + thickness.default.chromium.png | 69 | Changed |
vr-tests-react-components/TagPicker 1 screenshots
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| vr-tests-react-components/TagPicker.disabled.disabled input hover.chromium.png | 677 | Changed |
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PaulGMardling
marked this pull request as ready for review
July 31, 2026 09:46
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Previous Behavior
During server-side rendering,
FluentProviderinserted generated style selectors without escaping angle brackets. Prefixes supplied throughIdPrefixProvideror React'sidentifierPrefixcould therefore produce invalid inline style markup.New Behavior
createCSSRuleFromThemenow escapes angle brackets in selectors using CSS code-point escapes. This keeps server-rendered style markup valid while preserving the intended selector.Regression tests cover both
IdPrefixProviderand React'sidentifierPrefix.Related Issue(s)