[whatwg/fullscreen] Consider removing the containing block adjustment for popovers (Issue #218)

Popovers currently have their containing block adjusted as the result of going into the top layer. This behavior feels a bit unexpected, I started to use `position: relative` on a container, so I could use `top/left/right/bottom` positioning relative to the container on the popover, but I remembered only later that it doesn't work because of the top layer containing block adjustment. I know this use case is supposed to be achievable with the CSS anchored positioning API, but I wouldn't be surprised if web developers would be surprised about this behavior.

@mfreed7 @josepharhar What do you think?


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