Along with all of the newest devices – also come varying screen resolutions, definitions and orientations. New devices with different screen resolutions are being developed every day, and each of these devices are able to handle variations in size, functionality as well as color.
With Responsiveness aimed at crafting sites to provide an optimal viewing experience, modern built web sites must now be able to support basic mobile devices that lack JavaScript. There are now many ways of validating and testing Responsive Web Designed websites, ranging from mobile site validators and mobile emulators to simultaneous testing tools.