patch from Lars Heete:
Correct the generation of DOMAttrModified and DOMCharacterDataModified
mutation events.
- DOMAttrModified and DOMCharacterDataModified events get dispatched to
the parent chain.
- removing an attribute now generates a DOMAttrModified event with
newval=null
- adding an attribute now generates only one DOMAttrModified event
with oldval=null
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