[selectors-4] "Grid-Structural Selectors" needs clarity as to whether it applies to tables only, or also to CSS Grid (display: grid) #6590
Description
https://drafts.csswg.org/selectors-4/#table-pseudos
Use of the term "grid" suggests we may be dealing with CSS Grid, but all examples deal with <table> and its children.
If these selectors do apply to CSS Grid, the spec should probably complement the :nth-col pseudo-selector with a corresponding :nth-row pseudo-selector (see #1943).
Additionally, if these selectors apply to CSS grid, as the content and structure of CSS Grid rows/columns are defined by the CSS rather than by markup (which is the case for <table>), there are cyclic issues that may need consideration.