I didn't find any information about special diagram notations in the FAQ... I tried to put the string names next to the guitar neck diagram in this question, but this produced chord diagrams which weren't visible in the preview.
E - - - o o - o - O B - - - o o - o G - - - o - O - D - - - o - o o A - - - O - o o E - - - - - - -
Here the chord diagrams are not shown; I suppose because the feature is not active on the meta site?
So, where are these features documented, and could you please fix the preview? Thanks.