chromium/content/test/data/accessibility/language-detection/lang-attribute-switching.html

<!--
@BLINK-ALLOW:language=*
@WIN-ALLOW:language:*
@MAC-ALLOW:AXLanguage
-->
<!DOCTYPE html>
<html lang="en">
<body>
  <!-- Unspecified elements inherit language from parent. -->
  <p>
    In the morning, I sometimes eat breakfast.
  </p>
  <p lang="fr">
    Dans l'apres-midi, je dejeune.
  </p>
  <!-- Handle changing language in middle of paragraph. -->
  <p>
    Hello it's a pleasure to meet you. <span lang="fr">Comment ca va?</span>
  </p>

</body>
</html>