In practice 10 support is patchy, but can usually be fixed using the wonky old syntax and minimal hacking. For general use 11/Edge are fine. In fact, a usable

In practice 10 support is patchy, but can usually be fixed using the wonky old syntax and minimal hacking. For general use 11/Edge are fine. In fact, a usable desktop view for IE9 is relatively easy to frig with %widths and a handful of padding hacks.