Multiple tracks in a track-list with auto-fill
The repeat syntax can take a track-list rather than a single value, this means you can repeat a more complex track-list.
Currently does not work in Firefox
Credit to gridbyexample.com for inspiring this example.
[fl_row] {
display: grid;
grid-gap: 10px;
grid-template-columns: repeat(auto-fill, 100px 200px);
}