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

Based on CSS spec, the viewport does have some kind of style, and viewport is not the root element in the DOM tree.

You can find the following paragraph in [the spec](https://www.w3.org/TR/CSS22/visufx.html#overflow):
> UAs must apply the 'overflow' property set on the root element to the viewport. When ..., user agents must instead apply the 'overflow' property from the first such child element to the viewport, if the value on the root element is 'visible'. The 'visible' value when used for the viewport must be interpreted as 'auto'. The element from which the value is propagated must have a used value for 'overflow' of 'visible'.

And I don't think `overflow` on the viewport can be accessed via any API (nor any other CSS properties in general).

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