microsoft / microsoft/microsoft-ui-xaml
Add OnThinAcrylic card/layer brushes to WinUI theme resources
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@niels9001 is already working on this.
Since Jul 2, 2026.
accessibility
area-Design
area-Resources
feature proposal
team-Controls
- Dominant language
- C++
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Description
Proposal
Add three new theme resource brushes (and their backing Color resources) to WinUI:
CardBackgroundFillColorOnThinAcrylicDefaultBrushCardBackgroundFillColorOnThinAcrylicSecondaryBrushLayerOnThinAcrylicFillColorDefaultBrush
Source: Windows Fluent Design UI Kit
Proposed values
| Brush | Light | Dark | HighContrast |
|---|---|---|---|
| CardBackgroundFillColorOnThinAcrylicDefaultBrush | #E6F6F6F6 (#F6F6F6 @ 90%) |
#A6000000 (#000000 @ 65%) |
SystemColorWindowColor |
| CardBackgroundFillColorOnThinAcrylicSecondaryBrush | #F9F9F9 (100%) |
#86000000 (#000000 @ 52.5%) |
SystemColorWindowColor |
| LayerOnThinAcrylicFillColorDefaultBrush | #40FFFFFF (25%) |
#09FFFFFF (~3.59%) |
SystemColorWindowColor |
The HighContrast mapping follows the existing convention used by sibling card/layer brushes (CardBackgroundFillColorDefaultBrush, LayerOnAcrylicFillColorDefaultBrush, etc.).
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