chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-location-interface/reload_post_1-manual.html

<!doctype html>
<title>Reload document with POST</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var win = window.open("resources/reload_post_1-1.py");
var t = async_test();
var posted = false;
var reloaded = false;

next = t.step_func(function() {

if (posted && !reloaded) {
  reloaded = true;
  win.location.reload();
} else if (posted && reloaded) {
  t.done();
} else {
  posted = true;
  win.document.forms[0].submit();
}

});

add_completion_callback(function() {win.close()});
</script>