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<!doctype html>
<title>Option labels</title>
<select size=12>
<option><!-- No children, no label-->
<option><!-- No children, empty label-->
<option>label<!-- No children, label-->
<option><!-- No children, namespaced label-->
<option>child<!-- Single child, no label-->
<option>child<!-- Single child, empty label-->
<option>label<!-- Single child, label-->
<option>child<!-- Single child, namespaced label-->
<option>child node<!-- Two children, no label-->
<option>child node<!-- Two children, empty label-->
<option>label<!-- Two children, label-->
<option>child node<!-- Two children, namespaced label-->
</select>