<html>
  <head></head>
  <body>
    <div>
      <ul>
        <li>
          <span>오렌지 좋구요<span>
        </li>
        <li>
          <span>바나도 좋구요</span>
        </li>
        <li>
          <span>민트초코는 너무 좋구요</span>
        </li>
      </ul>
      <button onclick="focus_element()">focus</button>
      </div>
  </body>
</html>
body {
  display:flex;
  justify-content: center;
  align-items: center;
  width: 70%;
  height: 100vh;
  margin: 0 auto;
}
ul {
  width: 200px;
  height: 100px;
  list-style: none;
  border: 1px solid black;
  overflow: scroll;
}
li {
  margin: 5px;
  padding: 5px;
  background-color: yellow;
  font-size: 20px;
  display:flex;
  
}
span {
  flex: 0 1 auto;
}
let cnt = 1;
function focus_element() {
  cnt++;
  let ul = document.querySelector("ul");
  let li = document.createElement("li");
  li.textContent = "편식은 나빠요. 골고루 먹어야 180이상 큰답니다.";
  ul.append(li);
  
  let li_list = document.querySelectorAll('li');
  li_list[li_list.length - 1].scrollIntoView({behavior: "smooth"});
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.