Internet changes constantly. Ten years ago from simple text rich medium( pure HTML ), went to Flash, then CSS. More and more people started to use Internet all the time, being constantly on-line. Revolution in hardware sector which increased connection reliability, speed, wireless network range took it to the next level. Almost simultaneously mobile phones became "smartphones" kind of very microcomputers. From this point website needs to be well displayed on huge number of different devices. In this article I present few FREE websites which can help you with testing.