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chromium/content/test/data/accessibility/html/select.html 

<!--
@MAC-ALLOW:AXRoleDescription=*
@WIN-ALLOW:HASPOPUP
@WIN-ALLOW:haspopup*
@WIN-ALLOW:ia2_hypertext=*
@WIN-ALLOW:MULTISELECTABLE
@WIN-ALLOW:EXTSELECTABLE
@WIN-ALLOW:SELECT*
@BLINK-ALLOW:focus*
@BLINK-ALLOW:setSize*
@BLINK-ALLOW:posInSet*
@BLINK-ALLOW:haspopup*
@AURALINUX-ALLOW:haspopup*
@AURALINUX-ALLOW:posinset*
@AURALINUX-ALLOW:setsize*
@AURALINUX-ALLOW:expand*
@AURALINUX-ALLOW:required
-->
<html>
<body>
  <select id="A" name="Select A">
    <option value="">Placeholder option</option>
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
  </select>
  <select id="B" name="Select B">
    <option value="1">Option 1</option>
    <option value="2" selected>Option 2</option>
    <option value="3">Option 3</option>
  </select>
  <select id="C" name="Select C" required>
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
  </select>
  <select id="D" name="Select D" multiple="2">
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
  </select>
  <select id="E" name="Select E" size="3">
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
  </select>
</body>
</html>