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HTML

I want the background of mustache is <span style="color: blue">blue</span>.
<svg viewBox="0 0 100 100"
     xmlns="http://www.w3.org/2000/svg" 
     xmlns:xlink="http://www.w3.org/1999/xlink">     
  <circle cx="75" cy="15" r="10" stroke="black" stroke-width="3" fill="red" />
  <image xlink:href="http://c1940652.r52.cf0.rackcdn.com/520e7989896ad82797000006/mustache_ties_05.svg" height="50" width="50" background="blue" />    
</svg>

CSS

svg {
  background-color: red;
}