[dev-v5] Add optional dark mode flash prevention styles#4485
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Summary - Unit Tests Code CoverageSummary
CoverageMicrosoft.FluentUI.AspNetCore.Components - 98.9%
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vnbaaij-hanab
approved these changes
Jan 27, 2026
vnbaaij
approved these changes
Jan 27, 2026
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[dev-v5] Add optional dark mode flash prevention styles
Introduce optional styles to prevent a white flash when rendering in dark mode. This change enhances the user experience by ensuring a smoother transition to dark mode without visual disruptions.
Flash effect (optional)
When using the dark theme, you may notice a brief white "flash" before the page fully renders.
This occurs because the browser's default background color is white, and the FluentUI styles may not load instantly—especially on slower network connections.
To prevent this flash, add the following CSS to your
index.html,App.razor, or_layout.cshtmlfile (in the<head>...</head>HTML section).This sets a dark background color immediately, before the FluentUI styles are applied.
Notes: In Razor/CSHTML files, escape the
@symbol by doubling it: use@@mediainstead of@media.