If you scroll down on that test page you can see where my struggle is:

<http://new.los-chaos.ch/>

The body has 100% height, and should therfore get the documents 100% height.
But the Body only gehts the viewports 100% height, instead of the document 100% height.

The page should every time contain 100% document height.

The document height should be at least every time the viewport height.

There should no space at the top or bottom of the page.

I don't get why it only gets 100% viewport height right now..

Can someone explain this to me?