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dabblet.css

body { 
  background-color: white;
}
rect {
  background-color: #d3d3d3;
}

dabblet.html

<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
  width="120" height="120" viewBox="0 0 120 120"
  style="background-color: lightgray">
  <line x1="60" y1="60" x2="60" y2="110" stroke-width="2" stroke="#a0522d" />
</svg>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split-vertical","fontsize":"100","seethrough":"","prefixfree":"1","page":"css"}