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HTML

<select id="opts" selected="selected" onchange="document.getElementById('ExtraInfo').firstChild.nodeValue = this.options[this.selectedIndex].getAttribute('extrainfo')">
  <option value="buzzard" extrainfo="The buzzard is by far the most common of all our birds of prey, and its expansion has been dramatic">Buzzard</option>
  <option value="redkite" extrainfo="The red kite is a medium-large bird of prey in the family Accipitridae, which also includes many other diurnal raptors such as eagles, buzzards, and harriers">Red kite</option>
  <option value="sparrowhawk" extrainfo="Habitat and food availability remain the main limiting and controlling factors of sparrowhawk numbers">Sparrow hawk</option>
</select>

<div id="ExtraInfo">extra</div>

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