Lowercase the short word in the title

Warning²Federal courts, Illinois courts21st and 22nd editions

A blog or other section named after the colon takes title case even where the site's own heading does not, and title case keeps a short article, conjunction or preposition inside it in lower case.¹

1. 1R. 18.2.2(b)(ii) Titles for subdivisions contained within a larger web-based source. Tables: R. 8(a) Headings and titles.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.