In the code, the subgrid spans parent columns 2 through 4 (three tracks). How are the parent's line names exposed to the subgrid, and which line is line 1 inside the subgrid?
.parent {
display: grid;
grid-template-columns: [a] 1fr [b] 1fr [c] 1fr [d] 1fr [e] 1fr;
}
.child {
display: grid;
grid-column: 2 / 5;
grid-template-columns: subgrid;
}