---
category: Foundations
---

`--line-quiet` for `hairline`, `--line` for `strong` — the same ink as the page grid,
so a divider inside a card and the frame around it read as one drawing.

Composited, both land far under the mark floor. That is correct: **nothing may be
written on a rule**, and a rule may never be asked to separate meaning.

```tsx
<Rule />
<Rule tone="strong" />
```