У вашего броузера проблема в совместимости с HTML5
If frictional force is applied on skin over a bony surface like clavicle or near around periphery of lesions, if skin do peels off, this is known as Nikolsky's sign.
You can watch out our video where we are demonstrating this sign here
http://www.youtube.com/watch?v=3CZ_cFDufiM