submission_flush.html

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<!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>