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(function(d){
  var links = d.getElementsByTagName('link');
  var rss = 0;
  for (var i = 0; i < links.length; i++) {
    if (/application\/(rss|atom)\+xml/.test(links[i].type)) {
      rss = 1;
      break;
    }
  }
  if (rss) {
    alert('rss found');
  } else {
    alert('rss not found');
  }
})(document);