<!doctype html>
<script>
opener.history_length = history.length;
</script>
<form onsubmit="location = 'manual_form_submit_assign_during_load-2.html'; return false;">
<input type=submit value="Click Me">
</form>
<p>Filler image to keep the page loading:</p>
<img src="/media/2048x1360-random.jpg?pipe=trickle(d1:1:r2)">