A web designer's tasks are far from getting easier. More and more different resolutions come to market and have to be addressed in professional layouts. The formerly rather simple distinction between a site for mobile and another for desktop users is not sufficient anymore. With the success of smartphones of the most different sizes the problem grows bigger by the hour. Of course we have media queries to address different resolutions properly. And even though they do work in the majority of cases you still have to test them properly.