unload-form-post.html | Explore in Territory

<!DOCTYPE html>
<html>
<body>
<form id="fm" action="resources/fail-and-notify-done.html" method="POST"></form>
</body>
<script>
function submitForm() {
  document.getElementById("fm").submit();
  window.removeEventListener('unload', submitForm);
}

if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}

addEventListener("unload", submitForm);

window.location = "resources/pass-and-notify-done.html";
</script>
</html>

chromium/third_party/blink/web_tests/fast/loader/unload-form-post.html