[cl-who-devel] Looks like a bug to me?

[Richard Newman]

> What if I need to use format to generate the value, which is where
> this use case originally came from?
>
> (let ((userid 46))
>   (with-html-output (*standard-output*)
>          (:a :id (fmt "user-~A" userid))))

(:a :id (format nil "user-~A" userid))

Attributes can contain any Lisp expression.

If you want to make sure the user ID is escaped:

(:a :id (escape-string-minimal-plus-quotes
           (format nil "user-~A" userid)))