main frame - didStartProvisionalLoadForFrame
main frame - didCommitLoadForFrame
main frame - didReceiveTitle: Resending form on back navigation from POST submissions
frame "frame" - didStartProvisionalLoadForFrame
frame "frame" - didCommitLoadForFrame
frame "frame" - didFinishDocumentLoadForFrame
frame "frame" - didHandleOnloadEventsForFrame
frame "frame" - didFinishLoadForFrame
main frame - didFinishDocumentLoadForFrame
main frame - didHandleOnloadEventsForFrame
main frame - didFinishLoadForFrame
frame "frame" - willPerformClientRedirectToURL: http://127.0.0.1:8000/loading/resources/post-in-iframe-with-back-navigation-page-2.php 
frame "frame" - didStartProvisionalLoadForFrame
frame "frame" - didCancelClientRedirectForFrame
frame "frame" - didCommitLoadForFrame
frame "frame" - didFinishDocumentLoadForFrame
frame "frame" - didHandleOnloadEventsForFrame
frame "frame" - didFinishLoadForFrame
frame "frame" - willPerformClientRedirectToURL: http://127.0.0.1:8000/loading/resources/post-in-iframe-with-back-navigation-page-3.php 
frame "frame" - didStartProvisionalLoadForFrame
frame "frame" - didCancelClientRedirectForFrame
frame "frame" - didCommitLoadForFrame
frame "frame" - didFinishDocumentLoadForFrame
frame "frame" - didHandleOnloadEventsForFrame
frame "frame" - didFinishLoadForFrame
frame "frame" - didStartProvisionalLoadForFrame
frame "frame" - didCommitLoadForFrame
frame "frame" - didFinishDocumentLoadForFrame
frame "frame" - didHandleOnloadEventsForFrame
frame "frame" - didFinishLoadForFrame

Resending form on back navigation from POST submissions

To test manually, click on the navigation links in the iframe. When going back from page 3, it should navigate to page 2 without requesting to resend the form.

PASS successfullyParsed is true

TEST COMPLETE
PASS getTitle() is "Page 1"
PASS getTitle() is "Page 2"
PASS getTitle() is "Page 3"
PASS getTitle() is "Page 2"
PASS window.frames[0].document.getElementById('submissionTime').innerText is step2output