background-ref.html

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<!doctype html>

<meta charset=utf-8>

<style>

  div {

    position: relative;

  svg {

    display: block;

    margin: auto;

</style>

<body>

  <div>

    <svg xmlns='http://www.w3.org/2000/svg' width='100px' height='200px'

         viewport='0 0 100 200'>

      <rect x='0' y='100' width='100' height='100' fill='purple'>

      </rect>

    </svg>

  </div>

</body>