It's an interesting question.

I've tended to post chords (not that I've done it a lot) using HTML 'non-breaking spaces' This thread illustrates the problems inherent in that.

Jim makes a couple of good points, but I would argue against them.

For almost every 'chord request' the lyrics are available elsewhere. (the chords probably are too, but let's not go there...) so Mudcat isn't likely to be the sole source, and as such it doesn't really matter if the Mudcat entry comes 'first' in a Google search.

For more obscure stuff, I'd suggest that we have enough decent (and creative) web search experts who realise that a search for a few short phrases, is effective in overcoming the problem