title: is it possible to give html5 datalist trigger on given string length?
body: <p>is it possible to give html5 datalist trigger on given string length?</p>
  
  <pre><code>&lt;input list="tagLookup" id="tag" name="tag" type="text" placeholder="+ add custom tag" autocomplete=off triggerOn="3"&gt;
  &lt;datalist id="tagLookup"&gt;
    &lt;option value="aaaa"&gt;
    &lt;option value="bbbb"&gt;
    &lt;option value="cccc"&gt;
  &lt;/datalist&gt;  
  </code></pre>
  
  <p>Would like to show suggestion on 3 characters entered by user.</p>