Re: [dom] element.furthest(selector) proposal (#163)

I was dealing with <table>'s in an html editor, I could have a Range, and its range.commonAncestorContainer, and I needed to do `var startTd = range.startContainer.furthest('td', range.commonAncestorContainer)` (same for endContainer)

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https://github.com/whatwg/dom/issues/163#issuecomment-182764741