auto merge of #1724 : SimonSapin/servo/pseudo-element-parsing, r=larsbergstrom
auto merge of #1724 : SimonSapin/servo/pseudo-element-parsing, r=larsbergstrom



dati91/servo,larsbergstrom/servo,zhangjunlei26/servo,canaltinova/servo,larsbergstrom/servo,pyfisch/servo,tempbottle/servo,splav/servo,tschneidereit/servo,mt2d2/servo,nerith/servo,szeged/servo,canaltinova/servo,mbrubeck/servo,notriddle/servo,nick-thompson/servo,Adenilson/prototype-viewing-distance,zhangjunlei26/servo,codemac/servo,GyrosOfWar/servo,DominoTree/servo,larsbergstrom/servo,codemac/servo,bjwbell/servo,tschneidereit/servo,g-k/servo,bfrohs/servo,SimonSapin/servo,notriddle/servo,jdramani/servo,dmarcos/servo,brendandahl/servo,dsandeephegde/servo,cbrewster/servo,runarberg/servo,wpgallih/servo,ryancanhelpyou/servo,mrobinson/servo,samfoo/servo,avadacatavra/servo,echochamber/servo,dagnir/servo,g-k/servo,upsuper/servo,mattnenterprise/servo,SimonSapin/servo,fiji-flo/servo,jlegendary/servo,GreenRecycleBin/servo,seanmonstar/servo,avadacatavra/servo,A-deLuna/servo,karlito40/servo,zhangjunlei26/servo,sadmansk/servo,saneyuki/servo,AnthonyBroadCrawford/servo,youprofit/servo,DominoTree/servo,Shraddha512/servo,dati91/servo,nick-thompson/servo,evilpie/servo,snf/servo,dati91/servo,mbrubeck/servo,samfoo/servo,eddyb/servo,rentongzhang/servo,avadacatavra/servo,nnethercote/servo,brendandahl/servo,tschneidereit/servo,saratang/servo,aidanhs/servo,WriterOfAlicrow/servo,nnethercote/servo,ruud-v-a/servo,samfoo/servo,rnestler/servo,j3parker/servo,saneyuki/servo,avadacatavra/servo,splav/servo,sadmansk/servo,upsuper/servo,aidanhs/servo,KiChjang/servo,mrobinson/servo,s142857/servo,thiagopnts/servo,sadmansk/servo,bjwbell/servo,michaelwu/servo,pyecs/servo,vks/servo,cbrewster/servo,s142857/servo,dsandeephegde/servo,shrenikgala/servo,mt2d2/servo,dsandeephegde/servo,ruud-v-a/servo,GyrosOfWar/servo,peterjoel/servo,splav/servo,bjwbell/servo,rentongzhang/servo,szeged/servo,peterjoel/servo,splav/servo,dati91/servo,runarberg/servo,upsuper/servo,ConnorGBrewster/servo,ruud-v-a/servo,pyecs/servo,huonw/servo,RenaudParis/servo,fiji-flo/servo,sadmansk/servo,thiagopnts/servo,jimberlage/servo,rixrix/servo,aweinstock314/servo,rixrix/servo,WriterOfAlicrow/servo,Shraddha512/servo,anthgur/servo,tafia/servo,hyowon/servo,RenaudParis/servo,mt2d2/servo,GreenRecycleBin/servo,shrenikgala/servo,wartman4404/servo,j3parker/servo,notriddle/servo,froydnj/servo,emilio/servo,jimberlage/servo,jdramani/servo,RenaudParis/servo,s142857/servo,avadacatavra/servo,michaelwu/servo,vks/servo,KiChjang/servo,evilpie/servo,CJ8664/servo,pyfisch/servo,mbrubeck/servo,szeged/servo,DominoTree/servo,seanmonstar/servo,SimonSapin/servo,chotchki/servo,ryancanhelpyou/servo,akosel/servo,aweinstock314/servo,rentongzhang/servo,peterjoel/servo,pyecs/servo,ruud-v-a/servo,emilio/servo,rixrix/servo,paulrouget/servo,GreenRecycleBin/servo,echochamber/servo,A-deLuna/servo,DominoTree/servo,aidanhs/servo,kindersung/servo,wpgallih/servo,g-k/servo,brendandahl/servo,nrc/servo,WriterOfAlicrow/servo,jgraham/servo,shrenikgala/servo,bjwbell/servo,huonw/servo,deokjinkim/servo,saneyuki/servo,A-deLuna/servo,peterjoel/servo,jgraham/servo,jlegendary/servo,kindersung/servo,mdibaiee/servo,paulrouget/servo,snf/servo,srbhklkrn/SERVOENGINE,KiChjang/servo,evilpie/servo,emilio/servo,echochamber/servo,tempbottle/servo,tempbottle/servo,larsbergstrom/servo,bjwbell/servo,nick-thompson/servo,cbrewster/servo,jgraham/servo,ConnorGBrewster/servo,boghison/servo,chotchki/servo,g-k/servo,ryancanhelpyou/servo,saneyuki/servo,anthgur/servo,brendandahl/servo,mbrubeck/servo,runarberg/servo,dagnir/servo,karlito40/servo,dati91/servo,walac/servo,KiChjang/servo,aweinstock314/servo,DominoTree/servo,aidanhs/servo,indykish/servo,hyowon/servo,meh/servo,youprofit/servo,shrenikgala/servo,mt2d2/servo,nrc/servo,dati91/servo,fiji-flo/servo,walac/servo,GreenRecycleBin/servo,evilpie/servo,samfoo/servo,rnestler/servo,zentner-kyle/servo,splav/servo,vks/servo,dagnir/servo,rixrix/servo,steveklabnik/servo,juzer10/servo,rnestler/servo,jgraham/servo,GyrosOfWar/servo,nnethercote/servo,codemac/servo,notriddle/servo,deokjinkim/servo,dhananjay92/servo,walac/servo,tschneidereit/servo,vks/servo,nrc/servo,bfrohs/servo,larsbergstrom/servo,larsbergstrom/servo,eddyb/servo,RenaudParis/servo,aweinstock314/servo,ruud-v-a/servo,akosel/servo,pgonda/servo,mrobinson/servo,upsuper/servo,thiagopnts/servo,jgraham/servo,pyfisch/servo,A-deLuna/servo,chotchki/servo,zhangjunlei26/servo,s142857/servo,dagnir/servo,wpgallih/servo,thiagopnts/servo,akosel/servo,aidanhs/servo,huonw/servo,WriterOfAlicrow/servo,KiChjang/servo,evilpie/servo,thiagopnts/servo,paulrouget/servo,tempbottle/servo,szeged/servo,dmarcos/servo,thiagopnts/servo,KiChjang/servo,zentner-kyle/servo,splav/servo,emilio/servo,mdibaiee/servo,RenaudParis/servo,SimonSapin/servo,ConnorGBrewster/servo,j3parker/servo,kindersung/servo,GreenRecycleBin/servo,echochamber/servo,indykish/servo,deokjinkim/servo,canaltinova/servo,dvberkel/servo,s142857/servo,ryancanhelpyou/servo,upsuper/servo,CJ8664/servo,zhangjunlei26/servo,meh/servo,samfoo/servo,pyfisch/servo,michaelwu/servo,saratang/servo,karlito40/servo,codemac/servo,ConnorGBrewster/servo,A-deLuna/servo,dmarcos/servo,bjwbell/servo,peterjoel/servo,dsandeephegde/servo,luniv/servo,pgonda/servo,fiji-flo/servo,dvberkel/servo,meh/servo,luniv/servo,SimonSapin/servo,walac/servo,sadmansk/servo,caldwell/servo,tafia/servo,nerith/servo,caldwell/servo,codemac/servo,emilio/servo,tafia/servo,DominoTree/servo,jimberlage/servo,samfoo/servo,youprofit/servo,szeged/servo,Adenilson/prototype-viewing-distance,DominoTree/servo,boghison/servo,AnthonyBroadCrawford/servo,rentongzhang/servo,saneyuki/servo,bfrohs/servo,kindersung/servo,anthgur/servo,notriddle/servo,dati91/servo,froydnj/servo,steveklabnik/servo,saneyuki/servo,mukilan/servo,karlito40/servo,GyrosOfWar/servo,brendandahl/servo,mattnenterprise/servo,seanmonstar/servo,emilio/servo,bjwbell/servo,mrobinson/servo,hyowon/servo,mattnenterprise/servo,mattnenterprise/servo,nnethercote/servo,codemac/servo,upsuper/servo,g-k/servo,juzer10/servo,rentongzhang/servo,rixrix/servo,zentner-kyle/servo,codemac/servo,g-k/servo,RenaudParis/servo,caldwell/servo,notriddle/servo,mdibaiee/servo,deokjinkim/servo,hyowon/servo,nrc/servo,mukilan/servo,CJ8664/servo,steveklabnik/servo,dvberkel/servo,wartman4404/servo,nick-thompson/servo,zentner-kyle/servo,emilio/servo,AnthonyBroadCrawford/servo,shrenikgala/servo,rnestler/servo,A-deLuna/servo,caldwell/servo,paulrouget/servo,runarberg/servo,michaelwu/servo,steveklabnik/servo,paulrouget/servo,huonw/servo,zentner-kyle/servo,echochamber/servo,zentner-kyle/servo,mbrubeck/servo,emilio/servo,splav/servo,srbhklkrn/SERVOENGINE,notriddle/servo,ruud-v-a/servo,snf/servo,splav/servo,dati91/servo,mbrubeck/servo,dhananjay92/servo,DominoTree/servo,seanmonstar/servo,dsandeephegde/servo,bfrohs/servo,nerith/servo,GreenRecycleBin/servo,mukilan/servo,juzer10/servo,s142857/servo,rentongzhang/servo,KiChjang/servo,dvberkel/servo,snf/servo,indykish/servo,GyrosOfWar/servo,eddyb/servo,shrenikgala/servo,jimberlage/servo,boghison/servo,deokjinkim/servo,kindersung/servo,aidanhs/servo,aweinstock314/servo,larsbergstrom/servo,A-deLuna/servo,shrenikgala/servo,CJ8664/servo,Shraddha512/servo,snf/servo,karlito40/servo,AnthonyBroadCrawford/servo,fiji-flo/servo,nnethercote/servo,indykish/servo,mt2d2/servo,mdibaiee/servo,mdibaiee/servo,rentongzhang/servo,srbhklkrn/SERVOENGINE,wpgallih/servo,mukilan/servo,srbhklkrn/SERVOENGINE,avadacatavra/servo,akosel/servo,seanmonstar/servo,srbhklkrn/SERVOENGINE,juzer10/servo,canaltinova/servo,rixrix/servo,froydnj/servo,boghison/servo,j3parker/servo,GreenRecycleBin/servo,anthgur/servo,vks/servo,tschneidereit/servo,cbrewster/servo,akosel/servo,s142857/servo,nerith/servo,rnestler/servo,brendandahl/servo,nnethercote/servo,paulrouget/servo,splav/servo,anthgur/servo,cbrewster/servo,youprofit/servo,youprofit/servo,caldwell/servo,saratang/servo,boghison/servo,thiagopnts/servo,froydnj/servo,wartman4404/servo,SimonSapin/servo,emilio/servo,samfoo/servo,dvberkel/servo,mdibaiee/servo,nnethercote/servo,dagnir/servo,nick-thompson/servo,hyowon/servo,pyfisch/servo,jdramani/servo,huonw/servo,saneyuki/servo,evilpie/servo,sadmansk/servo,steveklabnik/servo,chotchki/servo,peterjoel/servo,GreenRecycleBin/servo,notriddle/servo,pgonda/servo,wartman4404/servo,youprofit/servo,saratang/servo,cbrewster/servo,eddyb/servo,mukilan/servo,walac/servo,saratang/servo,karlito40/servo,deokjinkim/servo,kindersung/servo,zhangjunlei26/servo,dmarcos/servo,paulrouget/servo,rnestler/servo,rixrix/servo,aweinstock314/servo,nerith/servo,nnethercote/servo,chotchki/servo,GyrosOfWar/servo,Shraddha512/servo,DominoTree/servo,saneyuki/servo,indykish/servo,mdibaiee/servo,anthgur/servo,AnthonyBroadCrawford/servo,dhananjay92/servo,szeged/servo,jimberlage/servo,echochamber/servo,mt2d2/servo,boghison/servo,saratang/servo,pyecs/servo,luniv/servo,mrobinson/servo,youprofit/servo,michaelwu/servo,notriddle/servo,chotchki/servo,dagnir/servo,luniv/servo,canaltinova/servo,froydnj/servo,KiChjang/servo,pyfisch/servo,nnethercote/servo,meh/servo,canaltinova/servo,Shraddha512/servo,meh/servo,pyfisch/servo,ConnorGBrewster/servo,wpgallih/servo,AnthonyBroadCrawford/servo,jgraham/servo,runarberg/servo,juzer10/servo,mt2d2/servo,ConnorGBrewster/servo,peterjoel/servo,szeged/servo,eddyb/servo,luniv/servo,evilpie/servo,nrc/servo,jdramani/servo,nick-thompson/servo,boghison/servo,hyowon/servo,seanmonstar/servo,akosel/servo,tafia/servo,GyrosOfWar/servo,indykish/servo,mattnenterprise/servo,eddyb/servo,pyecs/servo,dmarcos/servo,pgonda/servo,WriterOfAlicrow/servo,dsandeephegde/servo,tafia/servo,indykish/servo,jlegendary/servo,szeged/servo,juzer10/servo,KiChjang/servo,avadacatavra/servo,AnthonyBroadCrawford/servo,GreenRecycleBin/servo,runarberg/servo,nerith/servo,notriddle/servo,pgonda/servo,saratang/servo,jimberlage/servo,luniv/servo,eddyb/servo,tschneidereit/servo,deokjinkim/servo,caldwell/servo,mbrubeck/servo,dagnir/servo,peterjoel/servo,ryancanhelpyou/servo,CJ8664/servo,jimberlage/servo,vks/servo,cbrewster/servo,huonw/servo,jlegendary/servo,WriterOfAlicrow/servo,peterjoel/servo,DominoTree/servo,fiji-flo/servo,jgraham/servo,KiChjang/servo,wartman4404/servo,mattnenterprise/servo,larsbergstrom/servo,larsbergstrom/servo,tschneidereit/servo,dsandeephegde/servo,WriterOfAlicrow/servo,rixrix/servo,ryancanhelpyou/servo,luniv/servo,dhananjay92/servo,rixrix/servo,snf/servo,saneyuki/servo,SimonSapin/servo,nrc/servo,nick-thompson/servo,jlegendary/servo,wartman4404/servo,anthgur/servo,jlegendary/servo,pgonda/servo,bfrohs/servo,paulrouget/servo,nnethercote/servo,wpgallih/servo,karlito40/servo,zhangjunlei26/servo,emilio/servo,indykish/servo,wartman4404/servo,dhananjay92/servo,fiji-flo/servo,kindersung/servo,Shraddha512/servo,Adenilson/prototype-viewing-distance,mukilan/servo,evilpie/servo,aweinstock314/servo,peterjoel/servo,wpgallih/servo,nerith/servo,dhananjay92/servo,tempbottle/servo,vks/servo,ConnorGBrewster/servo,mbrubeck/servo,juzer10/servo,Adenilson/prototype-viewing-distance,eddyb/servo,wpgallih/servo,mrobinson/servo,dvberkel/servo,saneyuki/servo,thiagopnts/servo,pyfisch/servo,j3parker/servo,paulrouget/servo,fiji-flo/servo,snf/servo,sadmansk/servo,jdramani/servo,pyecs/servo,pyecs/servo,pyfisch/servo,j3parker/servo,upsuper/servo,froydnj/servo,upsuper/servo,akosel/servo,CJ8664/servo,jdramani/servo,tafia/servo,dmarcos/servo,aidanhs/servo,bfrohs/servo,hyowon/servo,rnestler/servo,brendandahl/servo,srbhklkrn/SERVOENGINE,nrc/servo,g-k/servo,tafia/servo,cbrewster/servo,jdramani/servo,steveklabnik/servo,szeged/servo,srbhklkrn/SERVOENGINE,RenaudParis/servo,jimberlage/servo,wpgallih/servo,walac/servo,Adenilson/prototype-viewing-distance,jlegendary/servo,CJ8664/servo,mattnenterprise/servo,tempbottle/servo,michaelwu/servo,sadmansk/servo,caldwell/servo,evilpie/servo,rnestler/servo,canaltinova/servo,ConnorGBrewster/servo,echochamber/servo,paulrouget/servo,ryancanhelpyou/servo,Adenilson/prototype-viewing-distance,runarberg/servo,Adenilson/prototype-viewing-distance,pgonda/servo,szeged/servo,CJ8664/servo,dhananjay92/servo,jimberlage/servo,meh/servo,dvberkel/servo,steveklabnik/servo,canaltinova/servo,mattnenterprise/servo,SimonSapin/servo,larsbergstrom/servo,avadacatavra/servo,tempbottle/servo,huonw/servo,zhangjunlei26/servo,anthgur/servo,pyfisch/servo,dsandeephegde/servo,walac/servo,meh/servo,zhangjunlei26/servo,dmarcos/servo,Shraddha512/servo,j3parker/servo,indykish/servo,splav/servo,zentner-kyle/servo