title: HTML Form: List - Number of elements shown
body: <p>In my html form, I currently have a text input as follows:</p>
  
  <pre><code>&lt;input list="BMUnits" name"BMUnitID" value"&lt;?php echo $chosenBMU ?&gt;" autocomplete="off"&gt;
  &lt;datalist id="BMUnits"&gt;
  &lt;option value="1"&gt;
  ...
  &lt;option value="300"&gt;
  &lt;/datalist&gt;
  </code></pre>
  
  <p>When the user types the drop down that shows the datalist goes off the screen, is there a way to define a certain number of elements in the datalist to be shown at once?</p>