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chromium/third_party/blink/web_tests/external/wpt/navigation-timing/resources/navigation-type-post-back.html 

<!DOCTYPE html>
<html>

<body>
  <form action="navigation_type_post_back.py" method="post">
    Post to page <button type="submit">Press to POST page</button>
  </form>
</body>

</html>