I would say no.
I had typed in everything here, but when I posted it, it kept loading for some 2 minutes. I clicked Back, and wow, everything was empty.
Checked drafts too. Gone, lol.
[Bits and parts that I could remember:]
You probably use firefox then since chrome does not delete the formular contents.
If this happens again then go back and if the form is empty go forward one page in history. Firefox will then ask you to resend the content. If you do then you might get your post sent.
Another tip is that you should install the firefox extension lazarus. It is an extremely valuable extension which saved me a lot of data already, not only on this forum.