code: function loadImage(event) {
    var image = event.target;
  
    // Swap in the srcset info and add an attribute to prevent duplicate loads.
    image.srcset = image.getAttribute('data-lazyload');
    image.setAttribute('data-loaded', true);
  }
docs: This almost seems too easy, but we simply swap in the correct srcset.
  @param  {Event} event the triggered event
  @return {Void}