OptionalcursorShare the hover: the others show crosshair + markers at the hovered data x (default: true)
Group name: instances with the same key are synced
OptionaltooltipFollowers also show their tooltip at the synced x (default: false = crosshair / markers only)
OptionalxShare x zoom / pan in data units (default: true)
Optionalyy ranges are never shared (scatter y domains differ per chart)
Per-instance membership (
Charturbo.create({ sync })/setSync).