Re: [whatwg/dom] add changed value to mutation record (#376)

Some history:
https://lists.w3.org/Archives/Public/public-webapps/2011JulSep/1622.html
https://lists.w3.org/Archives/Public/public-webapps/2011JulSep/1686.html
https://lists.w3.org/Archives/Public/public-webapps/2011JulSep/0779.html

It looks like one of the motivations for introducing mutation observer was the idea that it is more efficient to respond to the net effect of mutations rather than to each individually.

Since there are cases when the sequence of mutations is as important as the net effect of the mutations, there is a need for mutation events or for options for mutation observer.



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