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chromium/third_party/blink/web_tests/fast/forms/select/menulist-dynamic-style-change-expected.html 

<!DOCTYPE html>
<title>crbug.com/1103773</title>
<style>
select {
  padding-left: 1rem;
  padding-right: 1rem;
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
}
</style>
<body>
<select><option>abcd</select>
</body>