Whether this browser prefers a dark or light color scheme, and whether it asks sites to reduce motion. Nothing is uploaded.
Dark means the browser asked for a dark scheme. Light means it asked for a light one. No preference means it did not choose. cv.cm itself stays light. Reduced motion is a separate request about animation, not about the color of the room.
These preferences are read in this tab. They are not uploaded.
No. The reading is the browser's preference. cv.cm stays light.
No. It is a setting. It does not see the room.
A request that sites use less animation. It is separate from dark or light.
No. The preferences stay in this tab.
Reload the page after you change it. The reading is whatever the browser reports then.