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Published: September 7, 2026
"Add dark mode" leaves too many decisions open. A useful brief says whether appearance follows the operating system, a site control, an account preference, or a defined combination.
Define the preference order
State the initial behavior for a new visitor and what happens after a manual choice. Explain where the preference is stored, whether it crosses devices, and how it behaves before client-side code loads. Avoid a bright flash by agreeing on the rendering approach early.
Review tokens and assets
Map background, surface, text, border, link, focus, status, chart, and overlay colors to semantic tokens. Inspect logos, screenshots, transparent images, shadows, and browser UI metadata. A simple color inversion rarely produces a coherent result.
Test every meaningful state
- Default, hover, focus, active, disabled, error, and selected controls.
- Menus, modals, forms, tables, charts, and code samples.
- Forced colors, zoom, reduced motion, and high-contrast settings.
- System changes while the page is open.
- Saved preferences after refresh and sign-out.
Approve with side-by-side evidence
Capture the same representative pages and states in both themes. Record exceptions and their owners. Treat dark mode as a maintained theme, not a one-time launch effect.
Further reading
Prepare a color contrast brief
Related Articles
Pair theme acceptance with component and visual-regression governance.
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Turn the guidance into a reviewable handoff
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