Last year, Microsoft announced that IE10 will not be supporting conditional comments. With their history, this is obviously a risky move. Up to now, to target quirky behaviour in IE6-9, developers have been using conditional comments, conditional classes, and other IE-specific hacks.
But without conditional comments in IE10, the only options we’re left with to target CSS problems are hacks or browser sniffing — and we certainly don’t want to resort to the latter.
Interestingly, there have been a few posts and code snippets floating around that apparently do target IE10 specifically using a hack. Below is a summary of these three techniques, for reference.