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http://dom.spec.whatwg.org/#interface-attr [[ Setting the value attribute must change value to the new value. ]] The change algorithm needs to be passed an element as well.
This will be fixed once it is clear whether or not we can make the property readonly.
In https://github.com/whatwg/dom/commit/8af48267390b971a2ac02c7005ba42c08264b7e1 I made this readonly. Closing this for now. If this turns out to be incompatible we'll need to add all the methods that deal with Attr objects as well as the link between Attr objects and elements that we could not break.