From time to time people ask me on which devices and with which browsers I usually do testing. Simple answer: It depends – There are just too many aspects involved to give a straight answer. Nevertheless, within the last months I defined myself a basic test setup, which works out really well so far. It consists of four parts – Mockups, Design, User Interface and Final Check.
To get a first glimpse how the site should look like I usally start by producing Mockups with HTML and CSS. This part is taking place completely in the desktop browser, I prefer Firefox, because I love the “Responsive Design” feature. I usually test them starting from about 280 – 320px up to ~ 1600px. I try to spend not to much time in details in this step, it’s really just to get a basic idea.