Thanks for noticing that. However although the code in equation is slightly different to equation_html, it still fundamentally does the same thing.

I'll run some more test later. Though this does beg the question. Do we need to retain the original, verion 1, of this code (i.e. the 'equation' code). How many people genuinely need or use it. Even for advanced uses you can back out all the latex from output of equation_html.

As such I wonder if it might be simple to remove version 1 all together?

As a recent user - what is your own perspective? Have others a view?