Load combined svg file into body

## svgstore.html
<html>
<body>

  <!-- load combined svg file (with symbols) into body-->
  <script>
    (function (doc) {
      var scripts = doc.getElementsByTagName('script')
      var script = scripts[scripts.length - 1]
      var xhr = new XMLHttpRequest()
      xhr.onload = function () {
        var div = doc.createElement('div')
        div.innerHTML = this.responseText
        div.style.display = 'none'
        script.parentNode.insertBefore(div, script)
      }
      xhr.open('get', '/svg/icons.svg', true)
      xhr.send()
    })(document)
  </script>

  <!-- display single icon from combined file -->
  <svg width="40" height="40"><use xlink:href='#icon-name'></svg>

</body>
</html>