<!DOCTYPE html>
<div style="height: 100px">
</div>
<svg width="200" height="200" style="overflow: visible">
  <foreignObject width="200" height="200">
    <div id="x" style="position:fixed; top: 0; left: 0; width: 100px; height: 100px; background-color: red">
    </div>
  </foreignObject>
</svg>