<select id="dgre" onmouseout="size=1" onmouseover="size=options.length;">
  <option >11111</option>
  <option >22222</option>
  <option >33333</option>
  <option >44444</option>
</select>

<style type="text/css">
#dgre {font-size:x-large;width: 150px;}
#dgre:hover {width: 330px;}
#dgre option:hover {width: 530px;background-color:Gray;}
</style>

| 下拉式選單 | select | option | onmouseover | onmouseout |

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