silvester-23/static/lazy.js

window.onload = function(){

  var lazyImages = [...document.querySelectorAll("img[loading='lazy']")];

  for (let i = 0; i < lazyImages.length; i++) {
    var element = lazyImages[i];
    element.classList.add("lazy-image")
    element.onload = function(){
      element.classList.add("loaded");
    }
    element.addEventListener("load", function(){
      element.classList.add("loaded");
    })
  }

}