An attempt to calculate the number of blocking request on a webpage, uncertain of it's accuracy

estimateNumRequests

  function estimateNumRequests() {

    var netCount = 1; // 1 for the webpage itself
    var elements = null;

    // all css
    elements = document.getElementsByTagName('link');
    for (var i = 0; i < elements.length; i++) {
      var isStyleSheet = elementAttributeMatches(elements[i], 'rel', 'style') || elementIsTypeOf(elements[i], 'css');
      if (elements[i].getAttribute('href') && urlIsRemote(elements[i].getAttribute('href')) && isStyleSheet) {
        netCount++;
      }
    }

    // all scripts, exclude async (?) && !!!elements[i].async
    elements = document.getElementsByTagName('script');
    for (var i = 0; i < elements.length; i++) {
      if ( urlIsRemote(elements[i].getAttribute('src')) ) {
        netCount++;
      }
    }

    // all images
    elements = document.getElementsByTagName('img');
    for (var i = 0; i < elements.length; i++) {
      if ( urlIsRemote(elements[i].getAttribute('src')) ) {
        netCount++;
      }
    }

    // all background images
    elements = document.getElementsByTagName('*');
    for (var i = 0; i < elements.length; i++) {
      if ( elements[i].style && elements[i].style.backgroundImage && urlIsRemote(elements[i].style.backgroundImage) ) {
        netCount++;
      }
    }

    return netCount;
  }