Replace 'opacity' attribute with 'fill-opacity' and 'stroke-opacity'
Replace 'opacity' attribute with 'fill-opacity' and 'stroke-opacity'

Using 'fill-opacity' and 'stroke-opacity' produces identical visuals in other browsers, but in IE, just using 'opacity' sometimes causes graphical glitches, whereas using 'fill-opacity' and 'stroke-opacity' works as expected.
Asymmetrik/leaflet-d3,kamicut/leaflet-d3