In the Tree Construction section, "create a *" should link to the corresponding definition at the beginning of the Tree Construction section.

For example, in the Top-level mode, when the current input token is an "at-keyword token":

> Create an *at-rule* with its name set to the value of the current input token and push it onto the stack of open rules. Switch to the at-rule-prelude mode.

At the beginning of the Tree Construction section, there is a definition list with "at-rule" listed, along with it's definition:

> An at-rule has a name, a prelude consisting of a list of primitives, and a value consisting of a list of at-rules, style rules, or declarations.


It would be much clearer if this was linked to directly, everywhere any of the items in that definition list are mentioned.