text: (function() {
  
      'use strict';
    
      // define variables
      var items = document.querySelectorAll(".timeline li, .scroll-in-animate");
    
      // check if an element is in viewport
      // http://stackoverflow.com/questions/123999/how-to-tell-if-a-dom-element-is-visible-in-the-current-viewport
      function isElementInViewport(el) {
        var rect = el.getBoundingClientRect();
        return (
          rect.top >= 0 &&
          rect.left >= 0 &&
          rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
          rect.right <= (window.innerWidth || document.documentElement.clientWidth)
        );
      }
    
      function callbackFunc() {
        for (var i = 0; i < items.length; i++) {
          if (isElementInViewport(items[i])) {
            items[i].classList.add("in-view");
          }
        }
      }
    
      // listen for events
      window.addEventListener("load", callbackFunc);
      window.addEventListener("resize", callbackFunc);
      window.addEventListener("scroll", callbackFunc);
    
    })();