Handling long annotations over adjacent characters in Chinese

3.3.4.1 Basic Requirements 基本规则
http://w3c.github.io/clreq/#h-basic-requirements

只要不侵犯最小间距，可允许注文伸展到相邻基字上方。
Annotations are allowed to extend to the top of adjacent base text as long as the minimum spacing is ensured.

Is it possible to get some more detail on how this works? In JLReq annotations can overlap kana or punctuation, and then there are specific distances to be considered, but cannot overlap kanji. It sounds like romanized annotations can overlap adjacent hanzi characters in Chinese as well as punctuation. Is that correct? Are there any limitations (other than the need to separate the annotation by a minimum 1/4em space from adjacent ones)?

CLReq mentions that tracking may need to be adjusted where adjacent annotations are long enough to run into each other. Is this tracking meant to be for all characters on a line/in a paragraph/on a page? Or is it referring to just adding space around the affected characters?

Start with CLReq section 3.3.4.1, “Basic Requirements,” and compare its annotation-overlap and tracking guidance with the linked JLReq behavior. Clarify which adjacent Chinese characters or punctuation annotations may overlap, the spacing limitations, and whether tracking applies locally or more broadly; update the specification text once the requirements are agreed.