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HTML

<code>Accept-Language:</code>
<input placeholder="Locale code" id="locale-input" list="locale-list" />
<datalist id="locale-list">
  <option value="aa">
  <option value="ab">
  <option value="ae">
  <option value="af">
  <option value="ak">
  <option value="am">
  <option value="an">
  <option value="ar">
  <option value="ar-ae">
  <option value="ar-bh">
  <option value="ar-dz">
  <option value="ar-eg">
  <option value="ar-iq">
  <option value="ar-jo">
  <option value="ar-kw">
  <option value="ar-lb">
  <option value="ar-ly">
  <option value="ar-ma">
  <option value="ar-om">
  <option value="ar-qa">
  <option value="ar-sa">
  <option value="ar-sy">
  <option value="ar-tn">
  <option value="ar-ye">
  <option value="as">
  <option value="ast">
  <option value="av">
  <option value="ay">
  <option value="az">
  <option value="ba">
  <option value="be">
  <option value="bg">
  <option value="bh">
  <option value="bi">
  <option value="bm">
  <option value="bn">
  <option value="bo">
  <option value="br">
  <option value="bs">
  <option value="ca">
  <option value="ce">
  <option value="ch">
  <option value="co">
  <option value="cr">
  <option value="cs">
  <option value="csb">
  <option value="cu">
  <option value="cv">
  <option value="cy">
  <option value="da">
  <option value="de">
  <option value="de-at">
  <option value="de-ch">
  <option value="de-de">
  <option value="de-li">
  <option value="de-lu">
  <option value="dsb">
  <option value="dv">
  <option value="dz">
  <option value="ee">
  <option value="el">
  <option value="en">
  <option value="en-au">
  <option value="en-bz">
  <option value="en-ca">
  <option value="en-gb">
  <option value="en-ie">
  <option value="en-jm">
  <option value="en-nz">
  <option value="en-ph">
  <option value="en-tt">
  <option value="en-us">
  <option value="en-za">
  <option value="en-zw">
  <option value="eo">
  <option value="es">
  <option value="es-ar">
  <option value="es-bo">
  <option value="es-cl">
  <option...

CSS

input {
  width: 194px;
  height: 23px;
  margin: 5px;
  padding: 5px;
}