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css_selector = '#bs_form_main input[value=buchen]'
document.querySelector(css_selector)

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xpath='//*[@id="bs_tr3FE6EE511403"]/td[9]/input'
document.evaluate(xpath, document, null, XPathResult.ANY_TYPE, null).iterateNext()

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function x(xpath) {
  var result = document.evaluate(xpath, document, null, XPathResult.ANY_TYPE, null);
  var i = 0;
  while(result.iterateNext()){
    i++;
  }
  return i;
}