From here, it seems that syntax highlighting should work.
However, it doesn't seem to work for the javascript question I asked earlier, and some others - e.g:
Bitcore-p2p: Peer.connect does not work
https://bitcoin.stackexchange.com/a/76394/34190
Invalid checksum when generating BIP-39 Mnemonic
But it does work for other questions:
How to build a transaction using bitcoinjs-lib
Could it be something to do with my setup? Or is this a problem?