CodePen Embed - selectone

<select id="choice" multiple>
  <option value="yes">Yesです</option>
  <option value="no">Noです</option>
  <option value="yesno">YesでもありNoでもあります。</option>
</select>
<div id="box"></div>

let element = document.getElementById( "choice" );
element.onchange = function(){
  let a = this.value;
  document.getElementById('box').textContent = a;
}

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