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A form can have a width/height of 0 even though its fields are visible
in the browser.  E.g.,  http://www.lenson.com
  document.forms[0].getBoundingClientRect();
    { bottom: 196, height: 0, left: 37, right: 208, top: 196, width: 171, x: 37, y: 196 }
  document.forms[0][0].getBoundingClientRect();
    { bottom: 448, height: 22, left: 60, right: 196, top: 426, width: 136, x: 60, y: 426 }
  document.forms[0][1].getBoundingClientRect();
    { bottom: 495, height: 22, left: 60, right: 196, top: 473, width: 136, x: 60, y: 473 }
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