SVGMarkerElement: {
    prototype: SVGMarkerElement;
    SVG_MARKER_ORIENT_ANGLE: 2;
    SVG_MARKER_ORIENT_AUTO: 1;
    SVG_MARKER_ORIENT_UNKNOWN: 0;
    SVG_MARKERUNITS_STROKEWIDTH: 2;
    SVG_MARKERUNITS_UNKNOWN: 0;
    SVG_MARKERUNITS_USERSPACEONUSE: 1;
    new (): SVGMarkerElement;
}