Update: Here’s a much better version of this that someone has obviously spent a lot of time on – which I had found it before! http://truben.no/latex/table/ You can import TeX by going to Tools-> Import (although it doesn’t appear to work for my tables).
I didn’t finish this, but I will leave this post here in case anyone is interested in the jsFiddle
I’ve seen a new style of header around recently which I really like. It’s like a normal header, but once you being scrolling down the page, it sticks to the top as if it was position:fixed.