PathPropthTest

void PathPropsTes() {
    using namespace svg;
    using namespace std::string_view_literals;
    using namespace std::string_literals;

    class Tester : public PathProps<Tester> {
    public:
        Tester& setTestAttr() {
            return *this;
        }

        void Render(const RenderContext& context) const {
            auto& out = context.out;
            out << "<tester "sv;
            RenderAttrs(out);
            out << "/>"sv;
        }
    };
    {
        Tester().Render(std::cout);
        std::cout << std::endl;
    } {
        Tester().SetStrokeColor("yellow"s)
            .SetFillColor("green"s)
            .setTestAttr()
            .SetStrokeLineJoin(StrokeLineJoin::ROUND)
            .SetStrokeLineCap(StrokeLineCap::ROUND)
            .SetStrokeWidth(3)
            .Render(std::cout);
        std::cout << std::endl;
    } {
        Tester().SetFillColor("green"s)
            .SetStrokeLineCap(StrokeLineCap::ROUND)
            .SetStrokeLineJoin(StrokeLineJoin::ROUND)
            .setTestAttr()
            .SetStrokeWidth(3)
            .SetStrokeColor("yellow"s)
            .Render(std::cout);
    }

}
<tester />
<tester />
<tester fill="green" stroke="yellow" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>
<tester fill="green" stroke="yellow" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>