When the Web was created, it ran on one Web browser that ran on one type of desktop PC. But the technologies behind it all ran on open standards, so it didn’t take long before the Web proliferated into all of the devices we now use it on. Web developers don’t just have to worry about 640 × 480 desktop PC monitors. The Web runs on large monitors, small laptop monitors, TVs, high-DPI displays, mobiles, tablets, printed paper, screen readers…. The list goes on.
