The ABNF editor provides code templates for most ABNF keywords and dynamic grammar directives. Pressing Ctrl-space for completing one of those keywords inserts the keyword and try to complete the corresponding form. For example, completing a language keyword completes the whole header form for language and positions the cursor for immediately entering the language identifier.

For example, when completing the public keyword, the following pop-up is shown:

When selected, the following is produced:

Pressing the TAB key cycles between the two insertion points (the rule name and the rule expansion).