toggleBtn.addEventListener("click", () => { document.body.classList.toggle("dark-theme"); }); 2. Dynamic Form Validation Menampilkan pesan error real-time: const emailInput = document.getElementById("email"); emailInput.addEventListener("input", () => { const errorText = ... history.pushState: document.querySelectorAll(".nav-link").forEach(link => { link.addEventListener("click", (e) => { e.preventDefault(); history.pushState({}, "", e.target.href); document.getElementById("content").innerHTML = loadPage(e.target.dataset.page); }); }); 4. Real-Time Form Validation
