JavaScript

              
const txtType = document.getElementById("txtType");

txtType.addEventListener("input", (e) => {
  const filter = e.target.value.toUpperCase();
  const list = document.querySelectorAll('#list li');

  list.forEach((el) => {
    const lang = el.textContent.toUpperCase();
    el.style.display = lang.includes(filter) ? "" :"none";
  });
});