Using the datalist element, HTML5 allows you to create a list of data to autocomplete a input field. Super useful! Here is a sample code to re-use in your own projects.
<input name="frameworks" list="frameworks" />
<datalist id="frameworks">
<option value="MooTools">
<option value="Moobile">
<option value="Dojo Toolkit">
<option value="jQuery">
<option value="YUI">
</datalist>