There has been this feature request on Meta.SE since 2012: http://meta.stackexchange.com/questions/123274/

In May 2016 it was marked as [status-completed] and the following answer was posted by an SE admin:

> Matlab syntax support is rolling in.

>This is basic syntax support without keywords, as these add a lot to the size of the highlighter and do not gzip well at all.

>Still - comments should be comments and basic highlighting should work as expected.

This is great. I verified some time ago that it also works on our site: Matlab code gets highlighted correctly if I preface it with `<!-- language: lang-matlab -->`.

**However, it does not work automatically when a thread carries a [tag:matlab] tag.** I noticed it now [in this question](http://stats.stackexchange.com/questions/239075). It seems that it *does* work on StackOverflow though, or at least that's how I interpret the following comment:

> \o/ It's so working! All my posts suddenly became gorgeous! – Adriaan May 20 at 15:59

So it might be that the automatic highlighting for [tag:matlab] has not been rolled in specifically on CrossValidated. Hence I post it as a bug.