<p>This test passes if it does not crash.</p>
<div id="container"></div>
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  var root = document.getElementById('container').attachShadow({mode: 'open'});
  var svg1 = document.createElementNS(svgNS, 'svg');
  root.appendChild(svg1);
  var fo = document.createElementNS(svgNS, 'foreignObject');
  svg1.appendChild(fo);
  var svg2 = document.createElementNS(svgNS, 'svg');
  fo.appendChild(svg2);
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