Function draw_chip 

pub fn draw_chip(
    scene: &mut Scene,
    transform: Affine,
    text_renderer: &mut TextRenderer,
    theme: &Theme,
    rect: Rect,
    label: &str,
)

The floating material every floating surface is made of (blurred where the renderer runs the backdrop pass, the opaque panel ground otherwise), with the panel edge, at the control radius: a tooltip is a small floating Panel, not a card.