Note: 1 lwd = 1/96", but units in rest of document are 1/72"
     
    stroke_style(state, geom)
    Arguments
    
    
    
      | state | 
      list including 'gc' (graphics context)  | 
    
    
      | geom | 
      which geometry has asked for a style  | 
    
    
    Value
    character vector of multiple "attr_name: value" strings for
        'stroke', 'stroke-width', 'stroke-opacity'