<svg width="4in" height="2in" viewBox="0 0 4000 2000" version="1.1">      <defs>           <marker id="Triangle" viewBox="0 0 10 10" refX="0" refY="5" markerUnits="strokeWidth" markerWidth="4" markerHeight="3" orient="auto">                <path d="M 0 0 L 10 5 L 0 10 z"/>           </marker>      </defs>      <rect x="10" y="10" width="3980" height="1980" fill="none" stroke="blue" stroke-width="10"/>      <desc>Placing an arrowhead at the end of a path. </desc>      <path d="M 1000 750 L 2000 750 L 2500 1250" fill="none" stroke="black" stroke-width="100" marker-end="url(#Triangle)"/> </svg>

Original SVG source