title: SVG overwrite with transparency
body: <p>I have this svg:</p>
  
  <pre><code>&lt;circle cx="50" cy="100" r="50"  stroke-width="0" fill="orange"/&gt;
  &lt;polygon points="0,100, 50,50 100,100" fill="white"/&gt;
  </code></pre>
  
  <p>The background is transparent. The polygon overwrites the circle with white color, but I want this area to be transparent (instead of white). How can I do this?</p>