Dynamically specifying class of an element?

[Yang Zhang]

I'm probably missing something obvious. I tried:

li(class={"foo"})

But the generated code is just:

<li class>

Only li.foo works, but that's static. I need to dynamically generate
the class string.

Thanks in advance for any answers.

--
Yang Zhang
http://yz.mit.edu/

[Yang Zhang]

Oops, this actually works fine - I had a piece of JS that was removing
the classes.