stylo: properly handle ::before/::after rules applying to replaced elements.
stylo: properly handle ::before/::after rules applying to replaced elements.

Bug: 1376352
Reviewed-By: heycam
MozReview-Commit-ID: FO0TyWsPPG7

notriddle/servo,szeged/servo,sadmansk/servo,splav/servo,pyfisch/servo,saneyuki/servo,paulrouget/servo,pyfisch/servo,DominoTree/servo,anthgur/servo,canaltinova/servo,cbrewster/servo,larsbergstrom/servo,KiChjang/servo,jimberlage/servo,emilio/servo,larsbergstrom/servo,KiChjang/servo,ConnorGBrewster/servo,jimberlage/servo,DominoTree/servo,paulrouget/servo,ConnorGBrewster/servo,fiji-flo/servo,dati91/servo,avadacatavra/servo,KiChjang/servo,fiji-flo/servo,sadmansk/servo,szeged/servo,SimonSapin/servo,jimberlage/servo,paulrouget/servo,szeged/servo,splav/servo,pyfisch/servo,upsuper/servo,mattnenterprise/servo,splav/servo,peterjoel/servo,eddyb/servo,larsbergstrom/servo,thiagopnts/servo,avadacatavra/servo,fiji-flo/servo,sadmansk/servo,notriddle/servo,paulrouget/servo,SimonSapin/servo,mbrubeck/servo,KiChjang/servo,notriddle/servo,splav/servo,nnethercote/servo,anthgur/servo,thiagopnts/servo,SimonSapin/servo,rnestler/servo,DominoTree/servo,CJ8664/servo,jimberlage/servo,anthgur/servo,eddyb/servo,DominoTree/servo,notriddle/servo,canaltinova/servo,mbrubeck/servo,KiChjang/servo,szeged/servo,dsandeephegde/servo,CJ8664/servo,saneyuki/servo,notriddle/servo,ConnorGBrewster/servo,emilio/servo,DominoTree/servo,szeged/servo,cbrewster/servo,thiagopnts/servo,ConnorGBrewster/servo,dsandeephegde/servo,SimonSapin/servo,SimonSapin/servo,avadacatavra/servo,splav/servo,paulrouget/servo,dati91/servo,peterjoel/servo,nnethercote/servo,pyfisch/servo,avadacatavra/servo,szeged/servo,szeged/servo,thiagopnts/servo,fiji-flo/servo,upsuper/servo,mbrubeck/servo,avadacatavra/servo,nnethercote/servo,rnestler/servo,KiChjang/servo,cbrewster/servo,dati91/servo,paulrouget/servo,larsbergstrom/servo,notriddle/servo,cbrewster/servo,canaltinova/servo,dsandeephegde/servo,nnethercote/servo,mattnenterprise/servo,mbrubeck/servo,avadacatavra/servo,paulrouget/servo,sadmansk/servo,anthgur/servo,anthgur/servo,CJ8664/servo,saneyuki/servo,cbrewster/servo,SimonSapin/servo,SimonSapin/servo,jimberlage/servo,mattnenterprise/servo,saneyuki/servo,peterjoel/servo,dati91/servo,nnethercote/servo,dati91/servo,jimberlage/servo,eddyb/servo,peterjoel/servo,DominoTree/servo,cbrewster/servo,peterjoel/servo,cbrewster/servo,sadmansk/servo,saneyuki/servo,mattnenterprise/servo,KiChjang/servo,avadacatavra/servo,upsuper/servo,rnestler/servo,anthgur/servo,peterjoel/servo,larsbergstrom/servo,mbrubeck/servo,pyfisch/servo,emilio/servo,saneyuki/servo,CJ8664/servo,emilio/servo,KiChjang/servo,ConnorGBrewster/servo,rnestler/servo,splav/servo,larsbergstrom/servo,nnethercote/servo,saneyuki/servo,pyfisch/servo,notriddle/servo,DominoTree/servo,DominoTree/servo,peterjoel/servo,upsuper/servo,paulrouget/servo,mbrubeck/servo,notriddle/servo,jimberlage/servo,saneyuki/servo,mattnenterprise/servo,emilio/servo,szeged/servo,KiChjang/servo,splav/servo,paulrouget/servo,eddyb/servo,eddyb/servo,mbrubeck/servo,splav/servo,DominoTree/servo,peterjoel/servo,mattnenterprise/servo,ConnorGBrewster/servo,emilio/servo,CJ8664/servo,canaltinova/servo,fiji-flo/servo,ConnorGBrewster/servo,dati91/servo,thiagopnts/servo,KiChjang/servo,thiagopnts/servo,jimberlage/servo,nnethercote/servo,peterjoel/servo,nnethercote/servo,CJ8664/servo,pyfisch/servo,larsbergstrom/servo,larsbergstrom/servo,anthgur/servo,larsbergstrom/servo,peterjoel/servo,eddyb/servo,emilio/servo,dsandeephegde/servo,sadmansk/servo,rnestler/servo,emilio/servo,splav/servo,canaltinova/servo,eddyb/servo,emilio/servo,canaltinova/servo,upsuper/servo,pyfisch/servo,emilio/servo,saneyuki/servo,splav/servo,DominoTree/servo,rnestler/servo,canaltinova/servo,sadmansk/servo,dsandeephegde/servo,thiagopnts/servo,canaltinova/servo,avadacatavra/servo,dati91/servo,jimberlage/servo,mattnenterprise/servo,ConnorGBrewster/servo,szeged/servo,sadmansk/servo,upsuper/servo,pyfisch/servo,thiagopnts/servo,anthgur/servo,CJ8664/servo,dsandeephegde/servo,notriddle/servo,dati91/servo,upsuper/servo,mbrubeck/servo,CJ8664/servo,upsuper/servo,pyfisch/servo,dsandeephegde/servo,mattnenterprise/servo,paulrouget/servo,rnestler/servo,notriddle/servo,fiji-flo/servo,szeged/servo,saneyuki/servo,SimonSapin/servo,fiji-flo/servo,rnestler/servo,nnethercote/servo,larsbergstrom/servo,cbrewster/servo,nnethercote/servo,eddyb/servo,fiji-flo/servo,dsandeephegde/servo