toolbar.actions.icon
An
IconName, or raw SVG markup starting with <svg. An action icon that is neither a name nor markup starting with <svg draws nothing.string
Example
actions.iconTypeScript
// Custom SVG icon for an action button toolbar: { actions: [{ id: 'share', label: 'Share', icon: '<svg viewBox="0 0 20 20">...</svg>', onClick: () => { /* share logic */ } }] }