I thought based on this MSO question, it might be that syntax highlighting is supported here, as people rarely tag their questions with the appropriate language, so the highlighter might go into "null-mode" and do nothing. However this question of ours seems to be a counterexample, which is tagged c and not highlighted.
Based on the aforementioned MSO thread, I guess our entire site is blacklisted, which it should not be. Also, it might be preferable to just live with auto-detected formatting on everything versus mandating software tags...but that's another question. Conversely, I guess we could come up with our own list of
[arduino] = [lang-c], (...having trouble thinking of a common Java platform), etc.
The vast majority of code here is bound to be C, maybe some Java as well, which all should play nice with auto-detection. ASM would fail hard, but assembly isn't (as far as we care here) standardized (a.k.a.: "wtf is an x86").