Perhaps for some, this is not news, but I recently encountered this problem: Kaspersky Anti-Virus has blocked gif-animation . After conducting small experiments, I realized the following: Gif of about 50Kb in size, it shows only the first frame, if the size is larger, it does not display at all. Began to think. Usually when developing websites you check it in different browsers, maybe now you should also check it with different antiviruses? :)