"If that wasn’t enough, the explosion of smart phones and tablets has made the job of the web designer even harder. Designers can no longer assume a fixed-width canvas..." They never should have, and I'd say it's probably easier in some respects with smartphones because, while there's a multitude, they're all fixed, and you can generally target, say, 3-6, and cover a huge variety. And people generally can't change th…
> Compare with dozens of monitor and window sizes on desktops In practice, I think many developers just choose a fixed with, e.g. 960px, and leave it at that. The desktop window size and DPI can be largely ignored at that point. Phones and tablets really did throw a wrench into that easy solution. But I can't complain, because users should have access to devices with smaller screens.
Yes, but they were wrong to do that then, and the world is better off now that mobile devices are forcing those people to do things less badly.