<!doctype HTML>
<!doctype HTML>
<style>
* {
  margin: 0
}
</style>
<svg style="width: 500px; height: 500px">
  <rect x="0" y="0" width="100%" height="100%" style="fill: blue"/>
  <rect x="0" y="0" width="50%" height="50%"/>
</svg>

