H. G. Muller wrote on Sat, Mar 12, 2016 11:47 AM EST:
I don't know what happened, but it seems my article on interactive diagrams
has been completely corrupted, all less-than signs in it being interpreted
as HTML tags, rather than being printed. I am pretty sure this wasn't the
case when I last touched it. So it seems there is something changed in the
rendering scripts that corrupts the display...