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chromium/third_party/blink/web_tests/fast/selectors/lang-vs-xml-lang-xhtml.xhtml 

<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <title>':lang()': inherit LANG from parent element, xml:lang takes precedence in XML</title>
 <style>
  p:lang(x) { background: green }
  p:lang(y) { background: blue }
  p:lang(z) { background: red }
 </style>
 <div xml:lang="x-test" lang="z-test">
    <p>This line should have a green background.</p>
    <p lang="y-test">This line should NOT have a green background.</p>
 </div>
</html>