Marker placement is wrong
<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100">
<defs>
<marker id="marker" orient="auto-start-reverse" viewBox="0 0 10 10"
refX="0" refY="5" markerWidth="10" markerHeight="10"
markerUnits="userSpaceOnUse">
<path d="M0,0 L10,5 L0,10 Z" fill="green"/>
</marker>
</defs>
<path d="M20,50 L80,50" marker-start="url(#marker)" marker-end="url(#marker)" stroke-width="10" stroke="black"/>
</svg>
Regardless of support for auto-start-reverse
, this renders quite differently from Firefox/Inkscape. I ran into this while checking @madds-h's branch for #484 (closed).