[mradmin]

Is IE11 really considered "old"? IMO, these fixes need to be released for IE11, because flexbox is supposed to work in IE11.

[frik]

Exactly, MS should fix HTML5 bugs in IE11.

IE12 will be Win10-only (at least it won't run in Win7 as the normal support ends very soon) If the rumours are true, IE12 will come without the IE compatibility modes (IE7-10). And IE11 will ship as legacy browser next to IE11 for corporate users. So fixing the bugs in IE11 is even more important.