Fix attribute filter to better meet HTML spec.
Fix attribute filter to better meet HTML spec.

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