[SahAssar]

...By running the same JS on the server or in a build step.

[anitil]

Damn, I was hoping to discover some dark css magic that can be used to contruct some sort of parser

[eliseumds]

Indeed, indeed :(

[k_sze]

Same. :(

[zelphirkalt]

Although at that point one could also make use of the excellent pygments library from Python, to truly have no JS, if that was the point. It is used from inside many other languages' tools as well.