Make amp-story example validate (#13016)
Make amp-story example validate (#13016)


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znvg/amphtml,techhtml/amphtml,luciancrasovan/amphtml,taboola/amphtml,taboola/amphtml,kamtschatka/amphtml,jmadler/amphtml,rsimha-amp/amphtml,powdercloud/amphtml,prateekbh/amphtml,yieldbot/amphtml,zhouyx/amphtml,techhtml/amphtml,ampproject/amphtml,luciancrasovan/amphtml,nexxtv/amphtml,dotandads/amphtml,jridgewell/amphtml,camelburrito/amphtml,tlong2/amphtml,sebastianbenz/amphtml,powdercloud/amphtml,dotandads/amphtml,cory-work/amphtml,dotandads/amphtml,yieldmo/amphtml,erwinmombay/amphtml,yieldmo/amphtml,danielrozenberg/amphtml,danielrozenberg/amphtml,media-net/amphtml,yieldmo/amphtml,engtat/amphtml,zhangsu/amphtml,techhtml/amphtml,cory-work/amphtml,yieldbot/amphtml,sharethrough/amphtml,adup-tech/amphtml,camelburrito/amphtml,prateekbh/amphtml,yandex-pcode/amphtml,honeybadgerdontcare/amphtml,zhangsu/amphtml,src-code/amphtml,widespace-os/amphtml,powdercloud/amphtml,yandex-pcode/amphtml