front-end::marker, the second to be the result of passing the resource to <object/>, & seeing what it displays, and then then name, and then the size.subgridding all the way from the outermost <ol/> to the <dd/>s, with:grid-column to different :nth-of-types to no avail.grid-column: 1 / -1; to get it to cover the whole span, which only affected the first row.summary::markers are disappearing.