Perhaps I should clarify. I've got no issue with engineers seeking compensation for their work. I know the world can be a harsh place, and some people truly need the money.

Michael, you're absolutely right. People can insert whatever markup and JS they choose.

It simply seems an odd strategy for a CSS framework to squeak by on ads in the docs. An unfortunate side effect in this case is it makes it unclear what parts are documentation or examples, and what is an ad.