https://mumme-personal.de/files/js/fader.js

1(function() {
2  var scrollBottom = $(window).scrollTop() + $(window).height();
3  var selector = ".mod_article";
4/*   var selector =
5    "h1, h2, h3, .ce_text h2, .ce_text h3, .ce_text h4, .ce_text h5, .ce_text p, .ce_text li, .ce_list li, .ce_image, .ce_gallery, .ce_hyperlink, .ce_form, .ce_rsce_feature, .ce_rsce_ansprechpartner, .bewertung, #footer"; */
6  var elements = [];
7  var update = function() {
8    scrollBottom = $(window).scrollTop() + $(window).height();
9    elements.forEach(function(element) {
10      if (!element.visible && element.obj.offset().top <= scrollBottom) {
11        element.visible = true;
12        element.obj.delay(100).animate({ opacity: 1 }, 500);
13      } else if (element.visible && element.obj.offset().top > scrollBottom) {
14        element.visible = false;
15        element.obj.css({ opacity: 0 });
16      }
17    });
18  };
19  $(selector).each(function() {
20    var element = { obj: $(this) };
21    element.visible = element.obj.offset().top <= scrollBottom;
22    if (!element.visible) element.obj.css("opacity", 0);
23    elements.push(element);
24  });
25  $(window).scroll(update);
26  $(window).resize(update);
27})();