Howdy. According to the spec, if the external-graphic tag's overflow="hidden" (or NOT "visible"), and clip="auto", the image should be clipped to the parent block's size (if it is specified).
I think clipping (overflow="hidden") is not implemented. You can try to work around this by using an SVG, which can be clipped at the SVG viewport. SVGs can refer to graphic files in other formats.
In case of the dots, check whether you should rather use fo:leader.
J.Pietschmann
