Incorrect SVG marker size

[viktoras-pal]

<svg width="500" height="400"  viewBox="0 0 500 400" xmlns="http://www.w3.org/2000/svg">
<defs>
      <marker id="red-chevron"
      viewBox="0 0 10 10" refX="5" refY="5" orient="auto" >
         <path d="M 0 0 L 10 5 L 0 10" fill="none" stroke="red" />
      </marker>

      <marker id="black-arrow"
      viewBox="0 0 10 10" refX="0" refY="5" orient="auto">
         <path d="M 0 0 L 10 5 L 0 10 z" />
      </marker>

      <marker id="red-circle"
      viewBox="0 0 10 10" refX="5" refY="5" orient="auto" >
         <circle fill="red" cx="5" cy="5" r="5" />
      </marker>
  </defs>

  <line  x1="20" y1="20" x2="100" y2="100" stroke-width="8" stroke="blue" marker-start="url(#red-chevron)" marker-end="url(#black-arrow)" marker-mid="url(#red-circle)" />
  <text x="20" y="150"> line: marker-mid not applied</text>

  <polyline  points="220,20 300,100 400,20" fill="none" stroke-width="8" stroke="blue" marker-start="url(#red-chevron)" marker-end="url(#black-arrow)" marker-mid="url(#red-circle)" />
    <text x="250" y="150"> polyline </text>

  <polygon  points="20,190 100,200 150,300 100,350 20,260" marker-start="url(#red-chevron)" marker-end="url(#black-arrow)" marker-mid="url(#red-circle)" fill="none" stroke-width="5" stroke="black" />
   <text x="20" y="390"> polygon: end/start overlap </text>

  <path d="M250,350 l 25,-25 
        a15,5 -16 0,1 10,-15 l 20,-5 
        a15,10 -16 0,1 10,-15 l 20,-5 
        a15,25 -16 0,1 10,-15 l 20,-5 
        a15,35 -16 0,1 10,-15 l 20,-5"
        fill="none" stroke="green" stroke-width="2" marker-start="url(#red-chevron)" marker-end="url(#black-arrow)" marker-mid="url(#red-circle)"  />
      <text x="250" y="390"> path with arc segments </text>
</svg>

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