Modify classes
const e=document.querySelector("#fotoFrame img:first-child");console.log("classList",e.classList),console.log("className",e.className),e.className="shadow grayscale";const s=document.querySelector("#fotoFrame img:nth-child(2)");s.classList.remove("border","red"),s.classList.add("sepia");document.querySelector("#fotoFrame img:nth-child(3)").classList.toggle("green");const o=document.querySelector("#fotoFrame img:last-child");o.classList.replace("green","red"),console.log("contains",o.classList.contains("red"));