gtk:render-frame (context cr x y width height)

context -- a gtk:style-context object
cr -- a cairo:context-t context
x -- a number coerced to a double float with the x origin of the rectangle
y -- a number coerced to a double float with the y origin of the rectangle
width -- a number coerced to a double float with the rectangle width
height -- a number coerced to a double float with the rectangle height

Renders a frame around the rectangle defined by x, y, width, height.