Re: [whatwg/dom] Node.prototype.rootNode is not Web compatible (#241)

I think any name that ends with `ancestor` is [confusing](https://github.com/whatwg/dom/issues/241#issuecomment-215962485).  And names like `root` and `topNode` seem to be already being [used in the wild](https://github.com/whatwg/dom/issues/241#issuecomment-216150825).  Even names like `treeRootNode` are taken.

The current contenders are `treeTop` and `highestNode`.

`nodeTreeRoot` would work but it's a bit long.

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