Hi, I have MacBook Pro 2011 i5. Safari doesn't display videos properly. But Chrome displays the same videos properly. Please check attached photos. Left side - Chrome, right side - Safari. I installed fresh copy of MacOS (El Capitan, Sierra, High Sierra) but it didn't resolve this problem. I also replaced the HDD and instaled MacOS on blank HDD. Safari still doesn't display videos properly. I did reset NVRAM and SMC. Could you help me?