zammad/app/views/init/index.html.erb

<!-- svgstore fallback -->
<%= javascript_tag nonce: true do -%>
  /*
    detect if browser is
    - Chrome 14-20
    - Android Browser 4.1+
    - iOS 6-7
    - Safari 6
    - Edge 12
    - IE 9-11
  */
  window.svgPolyfill = /\bEdge\/12\b|\bTrident\/[567]\b|\bVersion\/7.0 Safari\b/.test(navigator.userAgent) || (navigator.userAgent.match(/AppleWebKit\/(\d+)/) || [])[1] < 537;

  (function (doc) {
    if(!svgPolyfill)
      return

    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.cssText = 'position: absolute; clip: rect(0, 0, 0, 0); z-index: -1;'
      script.parentNode.insertBefore(div, script)
    }
    xhr.open('get', 'assets/images/icons.svg', true)
    xhr.send()
  })(document)
<% end -%>
<div id="app"></div>
<div class="splash">
  <svg class="icon icon-logo"><use xlink:href="assets/images/icons.svg#icon-logo" /></svg>
  <div class="splash-title">Loading…</div>
</div>