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JavaScript JavaScript and the DOM (Retiring) Traversing the DOM Using previousElementSibling and insertBefore

I want to create up, down & remove button. While running the code up and down button is not getting created- spacing err

I want to create up, down & remove button. While running the code up and down button is not getting created. It shows only remove button . Other two very small box is coming. Is it spaciing error?

Below is the detail code:- index.html <!DOCTYPE html> <html> <head> <title>JavaScript and the DOM</title> <link rel="stylesheet" href="css/style.css"> </head> <body> <h1 id="myHeading">JavaScript and the DOM</h1> <p>Making a web page interactive</p> <button id = "toggleList">Hide List</button> <div class = "list"> <p class = "description">Things that are purple:</p> <input type="text" class="description"> <button class="description">Change list description</button> <ul> <li>grapes </li> <li>amethyst</li> <li>lavender</li> <li>plums</li> </ul> <input type="text" class="addItemInput"> <button class="addItemButton">Add item</button>

</div>
<script src="app.js"></script>

</body> </html>

app.js const toggleList = document.getElementById("toggleList"); const listDiv = document.querySelector(".list"); const descriptionInput = document.querySelector("input.description"); const descriptionButton = document.querySelector("button.description"); const descriptionP = document.querySelector("p.description"); const listUl = listDiv.querySelector("ul"); const addItemInput = document.querySelector("input.addItemInput"); const addItemButton = document.querySelector("button.addItemButton");

function attachListItemButtons(li) { let up = document.createElement("button"); up.className = "up"; up.textContent = "Up"; li.appendChild(up);

let down = document.createElement("button"); up.className = "down"; up.textContent = "Down"; li.appendChild(down);

let remove = document.createElement("button"); up.className = "remove"; up.textContent = "Remove"; li.appendChild(remove);

}

listUl.addEventListener("click", (event) => { if (event.target.tagName == "BUTTON") { if (event.target.className == "remove") { let li = event.target.parentNode; let ul = li.parentNode; ul.removeChild(li); } if (event.target.className == "up") { let li = event.target.parentNode; let prevLi = li.previousElementSibling; let ul = li.parentNode; ul.insertBefore(li,prevLi);

 }
 if (event.target.className == "down") {
let li = event.target.parentNode;
let nextLi = li.nextElementSibling;
let ul = li.parentNode;
ul.insertBefore(nextLi, li);

 }

} });

toggleList.addEventListener("click", () =>{

if (listDiv.style.display == "none") { toggleList.textContent = "Hide List"; listDiv.style.display = "block"; } else { toggleList.textContent = "Show list"; listDiv.style.display = "none"; }

                        });                         

descriptionButton.addEventListener("click", () =>{

descriptionP.innerHTML = descriptionInput.value; descriptionInput.value = ""; });

addItemButton.addEventListener("click", () => {

let ul = document.getElementsByTagName("ul") [0]; let li = document.createElement("li"); li.textContent = addItemInput.value; attachListItemButtons(li); ul.appendChild(li); addItemInput.value= "";

                           });