View difference between Paste ID: NhKpVsV7 and Ytf6MQUZ

 function solve() {
   let openSection = document.getElementsByTagName("section")[1];
   let progressSection = document.getElementsByTagName("section")[2];
   let completedSection = document.getElementsByTagName("section")[3];
 
   let addBtn = document.getElementById("add");
   addBtn.addEventListener("click", (event) => {
     event.preventDefault();
     let task = document.getElementById("task");
     let description = document.getElementById("description");
     let date = document.getElementById("date");
 
     if (task.value === "" || description.value === "" || date.value === "") {
       return;
     }
 
     let article = document.createElement("article");
     let h3 = document.createElement("h3");
     h3.innerText = task.value;
     let pDescription = document.createElement("p");
     pDescription.innerText = `Description: ${description.value}`;
     let pDate = document.createElement("p");
     pDate.innerText = `Due Date: ${date.value}`;
 
     let div = document.createElement("div");
     div.className = "flex";
     let btnStart = document.createElement("button");
     btnStart.className = "green";
     btnStart.innerText = "Start";
     let btnDelete = document.createElement("button");
     btnDelete.className = "red";
     btnDelete.innerText = "Delete";
 
     btnDelete.addEventListener("click", deleteArticle);
 
     btnStart.addEventListener("click", (event) => {
       let btnFinish = document.createElement("button");
       btnFinish.className = "orange";
       btnFinish.innerText = "Finish";
 
       btnFinish.addEventListener("click", () => {
         article.lastElementChild.remove();
         completedSection.lastElementChild.appendChild(article);
       });
 
       article.lastElementChild.children[0].remove();
       article.lastElementChild.appendChild(btnFinish);
       progressSection.lastElementChild.appendChild(article);
     });
 
     div.appendChild(btnStart);
     div.appendChild(btnDelete);
 
     article.appendChild(h3);
     article.appendChild(pDescription);
     article.appendChild(pDate);
     article.appendChild(div);
 
     openSection.lastElementChild.appendChild(article);
 
     task.value = "";
     description.value = "";
     date.value = "";
   });
 
   function deleteArticle(event) {
     event.target.parentElement.parentElement.remove();
   }
 }