Using CSS3 transforms, it would technically be possible to set text on a curve using the Lettering.js plugin. It would, however, require us to do quite a lot of calculations to get the letters arranged just so.

Thankfully, Pedro Botelho, author of the ArcText plugin, has figured out a way to let JavaScript do all the math for us. He started from the Lettering.js plugin, but then added the ability to set text perfectly to a curve of your choosing. The result is the ArcText plugin, which allows us to set any text on a curve of any radius.