This test verifies that a synchronous XMLHttpRequest, generated from a page that is the result of a form submission, loads properly when the user navigates back to the page.

When navigating back to a page that resulted from a form submission, the page is loaded with the ReturnCacheDataDontLoad cache policy. It is important that subresources (including XMLHttpRequest instances) do not inherit this cache policy.

This test doesn't work in browser, because it expects page cache to be disabled.