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CSS

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HTML 

              
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    </symbol>
</svg>
<svg>
  <use xlink:href="#robot" id="robot-1" />
</svg>
<svg>
  <use xlink:href="#robot" id="robot-2" />
</svg>
<svg>
  <use xlink:href="#robot" id="robot-3" />
</svg>

<p>If you're viewing this demo in any browser that does not support CSS Variables, the three robots will look the same. In Safari, there is <a href="https://bugs.webkit.org/show_bug.cgi?id=147932">a bug</a> preventing it from falling back to the appropriate fill values. Let's hope that gets fixed asap.</p>
!

CSS 

              
                svg {
  margin: 1em;
  width: 240px; 
  height: 400px;
}
#robot-1 {
  --primary-color: #0099CC;
  --secondary-color: #FFDF34;
  --tertiary-color: #333;
}
#robot-2 {
  --primary-color: #E52A39;
  --secondary-color: #11EBD8;
  --tertiary-color: #000;
}
/*#robot-3 {
  --primary-color: ;
  --secondary-color: ;
  --tertiary-color: ;
}*/


p {
  text-align: center;
  width: 60%;
  margin: 3em auto;
  color: grey;
}
!

JS
!
999px

Console