Ah! But can you use it to frame a post?

Yes you can,
however a little bit harder.

Now you just use background

Not background-image.

Which points out a fault in the video.

Ok so now that I realise my video in the previous post is wrong I need to explain why.
Firstly why did it work? Because I wanted it to repeat in both directions so background-image was ok, however to give further detail as in this case not wanting the image to repeat it is just the background tag.