Themes

Bone is OPERATOR's only theme: a warm, low-chroma accent on near-black surfaces. It applies by default; both forms are equivalent:

<html>...</html>
<html data-theme="bone">...</html>

Bone binds to :root and [data-theme="bone"]. The attribute reserves a hook for future themes without changing components or consumer markup. The same rule declares color-scheme: dark, so the browser draws scrollbars, select popups, and date and file pickers in their dark styles instead of leaving them light on near-black surfaces.

There is no light mode. Disable generic light/dark toggles in documentation chrome. Test suitability for the intended display, ambient light, and night-vision equipment in that environment; the palette alone establishes none of these.