<svg width="200" height="200" viewBox="0 0 80 20" xmlns="http://www.w3.org/2000/svg">
  <!-- Our symbol in its own coordinate system -->
  <symbol id="myDot" width="10" height="10" viewBox="0 0 2 2">
    <circle cx="1" cy="1" r="1" />
  </symbol>

   <!-- A grid to materialize our symbol positioning -->
  <path d="M0,10 h80 M10,0 v20 M25,0 v20 M40,0 v20 M55,0 v20 M70,0 v20" fill="none" stroke="pink" />

  <!-- All instances of our symbol -->
  <use href="#myDot" x="5"  y="5" style="opacity:1.0" />
  <use href="#myDot" x="20" y="5" style="opacity:0.8" />
</svg>

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