Re: [dom] Make Attr a Node again (#102)

If we make this change, we should also consider if any of `namespaceURI`, `prefix` and `localName` should be moved back to `Node`. We've successfully moved them to `Attr`+`Element` in Blink, but I think no other engine has done it. I've seen one [report](https://code.google.com/p/chromium/issues/detail?id=549103) of breakage where the difference between `null` and `undefined` really seems to have mattered, so while I think the change will stick, I wouldn't mind reverting it if nobody is inclined to follow.

---
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/issues/102#issuecomment-153649423