CSS Scroll Reveals (Simple WOW.js alternative)

main.js

      // Get height of window and set an offset from bottom
      var winHeight = $(window).height();
      var offset = 50;

      // Recalc height of window in case of resize
      $(window).bind('resizeEnd', function() {
        winHeight = $(window).height();
      });

      // When we scroll we do some checks...
      $(window).on('scroll', function() {

        // get current scrollPos
        var trigger = $(window).scrollTop() + winHeight - offset;

        // Rip through elements we're affecting
        $('.has-scroll-reveal:not(.is-revealed)').each(function() {
          var elementOffset = $(this).offset().top;

          if( elementOffset < trigger ) {
            $(this).addClass('is-revealed');
          }
        });

      });