Comment 12 for bug 208333

Now you perhaps realize why I haven't pushed this further.Much of the
problems is inside tkhtml which is not rendering correctly, but there can
also be "special" elements like gradients that only a certain vendor
supports. I've seen Microsoft have some acces to gradient drawings. So
beware for gradients. You need to look at the html to figure out.

Many things are not implemented by me, like url links, /me etc. There could
also be some differences of the html templates. You need to look inside to
figure out.

If you can isolate specific rendering problems to the tkhtml widget
providing simple examples, then add these to their bug tracker. Problems are
usually fixed very fast.

Then it doesn't hurt to look at the code in ChatTheme.tcl. Only very little
pain perhaps ;-) There you see how the templates are being used.