Document `visual-tests.json` with detailed comments  (#10621)
Document `visual-tests.json` with detailed comments  (#10621)


gumgum/amphtml,pedjoni8/amphtml,yieldmo/amphtml,voyagegroup/amphtml,lannka/amphtml,jmadler/amphtml,taboola/amphtml,pedjoni8/amphtml,luciancrasovan/amphtml,adup-tech/amphtml,alanorozco/amphtml,aghassemi/amphtml,sharethrough/amphtml,cory-work/amphtml,zhouyx/amphtml,ampproject/amphtml,jpettitt/amphtml,media-net/amphtml,rajkumarsrk/amphtml,keithwrightbos/amphtml,taboola/amphtml,mhc-gh/amphtml,cvializ/amphtml,laterpay/amphtml,widespace-os/amphtml,luciancrasovan/amphtml,media-net/amphtml,jmadler/amphtml,adiant/amphtml,Gregable/amphtml,smartadserver/amphtml,gumgum/amphtml,cory-work/amphtml,jpettitt/amphtml,dotandads/amphtml,mhc-gh/amphtml,sebastianbenz/amphtml,techhtml/amphtml,bpaduch/amphtml,danielrozenberg/amphtml,camelburrito/amphtml,comScore/amphtml,tlong2/amphtml,honeybadgerdontcare/amphtml,adiant/amphtml,src-code/amphtml,clawr/amphtml,vmarteev/amphtml,lannka/amphtml,alanorozco/amphtml,danielrozenberg/amphtml,chaveznvg/amphtml,jridgewell/amphtml,jmadler/amphtml,sebastianbenz/amphtml,mhc-gh/amphtml,yandex-pcode/amphtml,luciancrasovan/amphtml,vmarteev/amphtml,rsimha-amp/amphtml,widespace-os/amphtml,zhucl/amphtml,chaveznvg/amphtml,prateekbh/amphtml,cvializ/amphtml,techhtml/amphtml,yieldbot/amphtml,sharethrough/amphtml,media-net/amphtml,techhtml/amphtml,donttrustthisbot/amphtml,adiant/amphtml,engtat/amphtml,media-net/amphtml,jpettitt/amphtml,lannka/amphtml,prateekbh/amphtml,zhangsu/amphtml,yieldmo/amphtml,rsimha-amp/amphtml,donttrustthisbot/amphtml,Gregable/amphtml,taboola/amphtml,erwinmombay/amphtml,koshka/amphtml,arealit/amphtml,sharethrough/amphtml,vmarteev/amphtml,Gregable/amphtml,wjfang/amphtml,prateekbh/amphtml,smartadserver/amphtml,honeybadgerdontcare/amphtml,rajkumarsrk/amphtml,engtat/amphtml,mhc-gh/amphtml,keithwrightbos/amphtml,adup-tech/amphtml,koshka/amphtml,jpettitt/amphtml,bpaduch/amphtml,erwinmombay/amphtml,alanorozco/amphtml,vmarteev/amphtml,techhtml/amphtml,donttrustthisbot/amphtml,kamtschatka/amphtml,ampproject/amphtml,Gregable/amphtml,pedjoni8/amphtml,zhangsu/amphtml,yandex-pcode/amphtml,arealit/amphtml,kamtschatka/amphtml,bpaduch/amphtml,zhucl/amphtml,sebastianbenz/amphtml,techhtml/amphtml,erwinmombay/amphtml,nexxtv/amphtml,alanorozco/amphtml,powdercloud/amphtml,prateekbh/amphtml,kixer-com/amphtml,keithwrightbos/amphtml,bpaduch/amphtml,Gregable/amphtml,rsimha-amp/amphtml,rsimha-amp/amphtml,clawr/amphtml,pedjoni8/amphtml,tlong2/amphtml,taboola/amphtml,tlong2/amphtml,rsimha-amp/amphtml,arealit/amphtml,clawr/amphtml,rsimha-amp/amphtml,erwinmombay/amphtml,cory-work/amphtml,gumgum/amphtml,koshka/amphtml,yieldmo/amphtml,cvializ/amphtml,media-net/amphtml,lannka/amphtml,luciancrasovan/amphtml,pedjoni8/amphtml,chaveznvg/amphtml,shawnbuso/amphtml,donttrustthisbot/amphtml,bpaduch/amphtml,Gregable/amphtml,donttrustthisbot/amphtml,smartadserver/amphtml,keithwrightbos/amphtml,camelburrito/amphtml,smartadserver/amphtml,Gregable/amphtml,wjfang/amphtml,prateekbh/amphtml,ADITION/amphtml,prateekbh/amphtml,nexxtv/amphtml,BenDz/amphtml,jmadler/amphtml,clawr/amphtml,donttrustthisbot/amphtml,dotandads/amphtml,BenDz/amphtml,comScore/amphtml,mhc-gh/amphtml,nexxtv/amphtml,sebastianbenz/amphtml,dotandads/amphtml,adup-tech/amphtml,jmadler/amphtml,kamtschatka/amphtml,laterpay/amphtml,ampproject/amphtml,jridgewell/amphtml,adiant/amphtml,shawnbuso/amphtml,camelburrito/amphtml,aghassemi/amphtml,taboola/amphtml,yieldbot/amphtml,wjfang/amphtml,techhtml/amphtml,clawr/amphtml,kamtschatka/amphtml,cvializ/amphtml,kixer-com/amphtml,lannka/amphtml,gumgum/amphtml,engtat/amphtml,alanorozco/amphtml,voyagegroup/amphtml,cvializ/amphtml,kixer-com/amphtml,dotandads/amphtml,arealit/amphtml,ADITION/amphtml,sriramkrish85/amphtml,voyagegroup/amphtml,nexxtv/amphtml,BenDz/amphtml,adiant/amphtml,powdercloud/amphtml,tlong2/amphtml,danielrozenberg/amphtml,erwinmombay/amphtml,zhangsu/amphtml,chaveznvg/amphtml,kamtschatka/amphtml,vmarteev/amphtml,jridgewell/amphtml,mhc-gh/amphtml,src-code/amphtml,comScore/amphtml,shawnbuso/amphtml,cory-work/amphtml,nexxtv/amphtml,yieldmo/amphtml,danielrozenberg/amphtml,zhangsu/amphtml,jpettitt/amphtml,engtat/amphtml,widespace-os/amphtml,src-code/amphtml,zhucl/amphtml,koshka/amphtml,BenDz/amphtml,adiant/amphtml,keithwrightbos/amphtml,honeybadgerdontcare/amphtml,ADITION/amphtml,zhouyx/amphtml,luciancrasovan/amphtml,gumgum/amphtml,powdercloud/amphtml,comScore/amphtml,zhouyx/amphtml,kixer-com/amphtml,dotandads/amphtml,zhouyx/amphtml,prateekbh/amphtml,yieldbot/amphtml,yieldbot/amphtml,comScore/amphtml,chaveznvg/amphtml,chaveznvg/amphtml,donttrustthisbot/amphtml,arealit/amphtml,BenDz/amphtml,honeybadgerdontcare/amphtml,comScore/amphtml,cvializ/amphtml,rajkumarsrk/amphtml,kixer-com/amphtml,sebastianbenz/amphtml,honeybadgerdontcare/amphtml,kamtschatka/amphtml,kixer-com/amphtml,sriramkrish85/amphtml,ampproject/amphtml,shawnbuso/amphtml,cory-work/amphtml,aghassemi/amphtml,media-net/amphtml,lannka/amphtml,sebastianbenz/amphtml,voyagegroup/amphtml,jpettitt/amphtml,luciancrasovan/amphtml,zhouyx/amphtml,tlong2/amphtml,erwinmombay/amphtml,zhangsu/amphtml,danielrozenberg/amphtml,sriramkrish85/amphtml,camelburrito/amphtml,adup-tech/amphtml,shawnbuso/amphtml,rajkumarsrk/amphtml,jridgewell/amphtml,zhangsu/amphtml,comScore/amphtml,src-code/amphtml,wjfang/amphtml,wjfang/amphtml,sriramkrish85/amphtml,media-net/amphtml,keithwrightbos/amphtml,ampproject/amphtml,jmadler/amphtml,yandex-pcode/amphtml,voyagegroup/amphtml,tlong2/amphtml,sharethrough/amphtml,yandex-pcode/amphtml,danielrozenberg/amphtml,engtat/amphtml,alanorozco/amphtml,ampproject/amphtml,ADITION/amphtml,aghassemi/amphtml,yieldmo/amphtml,arealit/amphtml,shawnbuso/amphtml,nexxtv/amphtml,mhc-gh/amphtml,laterpay/amphtml,powdercloud/amphtml,danielrozenberg/amphtml,engtat/amphtml,yieldbot/amphtml,camelburrito/amphtml,luciancrasovan/amphtml,nexxtv/amphtml,vmarteev/amphtml,aghassemi/amphtml,laterpay/amphtml,yandex-pcode/amphtml,shawnbuso/amphtml,keithwrightbos/amphtml,laterpay/amphtml,yieldbot/amphtml,yieldmo/amphtml,zhucl/amphtml,media-net/amphtml,rsimha-amp/amphtml,voyagegroup/amphtml,rajkumarsrk/amphtml,jridgewell/amphtml,zhouyx/amphtml,vmarteev/amphtml,honeybadgerdontcare/amphtml,ampproject/amphtml,adiant/amphtml,yandex-pcode/amphtml,zhouyx/amphtml,dotandads/amphtml,BenDz/amphtml,sriramkrish85/amphtml,rajkumarsrk/amphtml,sriramkrish85/amphtml,smartadserver/amphtml,bpaduch/amphtml,cory-work/amphtml,src-code/amphtml,ampproject/amphtml,camelburrito/amphtml,widespace-os/amphtml,taboola/amphtml,yieldmo/amphtml,gumgum/amphtml,ADITION/amphtml,smartadserver/amphtml,powdercloud/amphtml,alanorozco/amphtml,aghassemi/amphtml,bpaduch/amphtml,pedjoni8/amphtml,widespace-os/amphtml,lannka/amphtml,Gregable/amphtml,zhucl/amphtml,mhc-gh/amphtml,alanorozco/amphtml,yandex-pcode/amphtml,koshka/amphtml,zhucl/amphtml,adup-tech/amphtml,powdercloud/amphtml,clawr/amphtml,gumgum/amphtml,sharethrough/amphtml,powdercloud/amphtml,wjfang/amphtml,widespace-os/amphtml,jpettitt/amphtml,adup-tech/amphtml,jridgewell/amphtml,danielrozenberg/amphtml,sharethrough/amphtml,jpettitt/amphtml,clawr/amphtml,jridgewell/amphtml,rajkumarsrk/amphtml,taboola/amphtml,kixer-com/amphtml,voyagegroup/amphtml,zhucl/amphtml,honeybadgerdontcare/amphtml,koshka/amphtml,engtat/amphtml,wjfang/amphtml,cory-work/amphtml,camelburrito/amphtml,arealit/amphtml,src-code/amphtml,laterpay/amphtml