A difficulty about the fact that there are lots of different devices for your website, is that every device has its own standards and your user uses your website differently on every device. Navigation is the most important one to check. On the most common devices it works good, but I for example have a laptop with touchscreen. I don’t use that often, but some websites give me only the option to navigate with touchscreen. Try to keep that in mind, because a computer with touchscreen is not a rare thing these days.