<script>
window.addEventListener("load", function () {
  document.querySelector("select").focus();
}, false);
</script>
<select>
  <option>banana</option>
  <option>papaya</option>
  <option>orange</option>
  <option>banana</option>
  <option>papaya</option>
  <option>orange</option>
  <option>banana</option>
  <option>papaya</option>
  <option>orange</option>
  <option>banana</option>
  <option>papaya</option>
  <option>orange</option>
  <option>banana</option>
  <option>papaya</option>
  <option>orange</option>
  <option>banana</option>
  <option>papaya</option>
  <option>orange</option>
</select>