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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-selectlist-element/selectlist-writingmode-lr.tentative.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/openui/open-ui/issues/600">
<link rel=mismatch href="selectlist-writingmode-tb-ref.html">

<selectlist style="writing-mode: vertical-lr">
  <option>hello</option>
</selectlist>