Function token 

pub fn token(
    style: &PieceStyle,
    label: &str,
    kind: Token,
    tone: Tone,
    latched: bool,
    focused: bool,
) -> Span<'static>

A badge or a chip as one span.

Round for a badge, square for a chip. A chip answers a press and a badge does not, and the bracket is the only affordance a cell has left once colour is spent on the tone.

latched is a chip that is switched on, and it reads as reversed. So does focus, which is a collision a terminal cannot avoid: latched is “this filter is on” and focused is “you are here”, and there is one spare axis for two facts. Said here rather than resolved by inventing a third look nobody would read.

A chip’s removable half is not drawn. The x a webview hangs on a chip is a second control inside one span, and a terminal reaches a control by focusing it; two targets in one cell run is a question for whoever owns the interaction, not for a drawing.