<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8"/>
    <title>Submission Flush Test</title>
  </head>
  <body>
    <form id="test_form" action="post_action_page.html" target="form_target" method="POST" onsubmit="return false;">
      <button type="submit" id="submit_button">Submit</button>
    </form>
    <iframe name="form_target" id="test_frame"></iframe>
  </body>
</html>
