The old rules for supporting screen resolutions were simple. Monitors were basically all the same shape and new ones just got a little bigger... so all you really had to do was support the standard resolution of new monitors, plus one resolution "back". Easy!

But these days the rules aren't so simple. Desktop monitors are generally bigger, but they come in a variety of sizes and ratios; and users don't always maximise their browser windows anyway. People are browsing on tiny mobile phones that weren't really designed for anything longer than a text message. Devices like the iPhone, Nintendo Wii and Asus Eee PC are new and shiny, yet their resolution is retro.

Read more: Choose your resolution...