Size

<img width="100px" src="../examples/size.svg">

<img width="300px" src="../examples/size.svg">

<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
  <rect width="100%" height="100%" fill="white" stroke="black" stroke-width="1" />
  <rect width="100" height="50" fill="blue" />
</svg>