Add tests for onevent props and setAttributeNode & attr::set value
Add tests for onevent props and setAttributeNode & attr::set value

The test cases fail, because onevent properties are only set in setAttribute.

tmpvar/jsdom,jeffcarp/jsdom,kittens/jsdom,cpojer/jsdom,mzgol/jsdom,evanlucas/jsdom,lcstore/jsdom,Sebmaster/jsdom,sebmck/jsdom,zaucy/jsdom,darobin/jsdom,crealogix/jsdom,susaing/jsdom,beni55/jsdom,mzgol/jsdom,szarouski/jsdom,selam/jsdom,evdevgit/jsdom,sirbrillig/jsdom,mbostock/jsdom,beni55/jsdom,kittens/jsdom,evanlucas/jsdom,jeffcarp/jsdom,snuggs/jsdom,cpojer/jsdom,vestineo/jsdom,nicolashenry/jsdom,beni55/jsdom,Sebmaster/jsdom,sirbrillig/jsdom,danieljoppi/jsdom,darobin/jsdom,papandreou/jsdom,Joris-van-der-Wel/jsdom,szarouski/jsdom,evanlucas/jsdom,medikoo/jsdom,sebmck/jsdom,lcstore/jsdom,concord-consortium/jsdom,darobin/jsdom,mbostock/jsdom,szarouski/jsdom,kevinold/jsdom,evdevgit/jsdom,AVGP/jsdom,Ye-Yong-Chi/jsdom,Zirro/jsdom,kesla/jsdom,dexteryy/jsdom-nogyp,medikoo/jsdom,nicolashenry/jsdom,evdevgit/jsdom,fiftin/jsdom,vestineo/jsdom,robertknight/jsdom,aduyng/jsdom,danieljoppi/jsdom,susaing/jsdom,kesla/jsdom,AshCoolman/jsdom,Ye-Yong-Chi/jsdom,tmpvar/jsdom,sirbrillig/jsdom,kevinold/jsdom,zaucy/jsdom,kesla/jsdom,fiftin/jsdom,crealogix/jsdom,Ye-Yong-Chi/jsdom,Zirro/jsdom,kevinold/jsdom,robertknight/jsdom,AshCoolman/jsdom,aduyng/jsdom,selam/jsdom,medikoo/jsdom,janusnic/jsdom,janusnic/jsdom,nicolashenry/jsdom,concord-consortium/jsdom,kangax/jsdom,zaucy/jsdom,AVGP/jsdom,dexteryy/jsdom-nogyp,jeffcarp/jsdom,mzgol/jsdom,Joris-van-der-Wel/jsdom,aduyng/jsdom,janusnic/jsdom,fiftin/jsdom,selam/jsdom,vestineo/jsdom,AshCoolman/jsdom,papandreou/jsdom,mbostock/jsdom,lcstore/jsdom,snuggs/jsdom,kittens/jsdom,cpojer/jsdom,kangax/jsdom,robertknight/jsdom,susaing/jsdom,sebmck/jsdom,danieljoppi/jsdom,Joris-van-der-Wel/jsdom,Sebmaster/jsdom