<select id="choice">
  <option value="yes">Yesです</option>
  <option value="no">Noです</option>
</select>
<div id="box"></div>
let selector = document.querySelector('#choice');
selector.addEventListener('change', (event) => {
  let box = document.querySelector('#box');
  box.textContent = event.target.value;
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.