<form>
<fieldset>

<input type="search" name="q" autocomplete="on" list="keywords">
<datalist id="keywords">
<option value="tanaka takashi">
<option value="tanaka yutaka">
<option value="tanaka maki">
<option value="tanaka satoshi">
</datalist>

<input type="submit" value="送信">
</fieldset>
</form>