Re: [fullscreen] Propose to always render elements in the top layer as if it is fixed positioned (#19)

I'm confused about the interaction between the scrollbar of the page and the top layer.

So if we a page has scrollbars, how should top layer elements be rendered? A or B?

![top-layer-scrollbar](https://cloud.githubusercontent.com/assets/333750/9732327/5ff002aa-5666-11e5-8fc2-845839a9595d.png)
A seems to be unfortunate for fullscreen, while B implies that `position: absolute` is useless for top layer element. Alternatively, we can probably say, we render like A but hide the scrollbar in fullscreen?

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https://github.com/whatwg/fullscreen/issues/19#issuecomment-138506017