"green" SVG
Consider a fill or stroke styled green:
node [style=filled,color="green"];
According to the documentation the correct RGB color for green is 0x00FF00.
With an SVG export (circo -Tsvg) the generated SVG uses the literal color name green
which is 0x008000 (the same color that CSS associates with "green").
According to the SVG specification the named color green
is based on the CSS Color Module specification which defines green as 0x008000
The SVG exporter should write the RGB color #00FF00
instead of green