ar inline = elementName === 'i' ? 'b' : 'i';
    return ('<' + inline + '><' + elementName + '>before</'
        + inline + '>after</' + elementName + '>');
  }
  // Examines the resulting body to fold a single experiment into the result.
  function isResumable(elementName, body, result) {
    //result[elementName] = false;  // until proven otherwise
    var els = body.getElementsByTagName(elementName);
    for (var i = 0, n = els.length; i < n; ++i) {
      if ('after' == els[i].textContent) {
        resu