<html>
  <head>
    <script>
      function go () {
        try { o1 = document.getElementById('x') } catch(e) { }
        try { o1.src = '=' } catch(e) { }
        try { o2 = document.cloneNode(false) } catch(e) { }
        try { o3 = new XMLHttpRequest({mozAnon: true}) } catch(e) { }
        try { o3.open('GET', 1, false) } catch(e) { }
        try { o3.send() } catch(e) { }
        try { o2.prepend('', o1, '', o2) } catch(e) { }
      }
      document.addEventListener('DOMContentLoaded', go)
    </script>
  </head>
  <body>
    <picture>
      <img id='x' src='data:image/png;base64,R0lGODlhAQABAAD/ACH/C05FVFNDQVBFMi4wAwEAAAAsAAAAAEAAQAAAgA'/>
  </body>
</html>