This is a minimal example which shows knitr working with HTML pages. See here for the output.

Boring stuff as usual:

We can also produce plots (centered by the option fig.align='center'):

Errors, messages and warnings can be put into div's with different classes:

In the end, let's show off a 3D plot from the rgl package.

Well, everything seems to be working. Let's ask R what is the value of π? Of course it is .