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chromium/third_party/blink/web_tests/external/wpt/html/rendering/bindings/the-select-element-0/option-label-ref.html 

<!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>