at present, the following normative statements in HTML5 effectively translate to mandating all of the interfaces defined by CSSOM (or at least those transitively reachable via LinkStyle):

4.2.4 HTMLLinkElement implements LinkStyle
4.2.7 The style and link elements implement the LinkStyle interface. [CSSOM]
7.2.6 HTMLStyleElement implements LinkStyle

as such, all of the (transitively reachable) interfaces of CSSOM will need to be listed in 2.2.2 Dependencies;

since they are not listed in 2.2.2, I wonder if it was really the intention of the editors to establish this hard linkage to CSSOM interface types; if it was not the intention, then I would suggest moving the above normative statements into CSSOM itself, or restating in a manner that does not necessitate the logical dependency