Build with the factory helpers: GridTrack.autoSize (fit the content),
GridTrack.pixels(n) (a fixed width/height), or GridTrack.percent(w) (a
weighted share of the leftover space — the weights of all percent tracks are
summed, so two percent(50) tracks split the remainder evenly, exactly like
two percent(1) tracks would).
The size rule for one column or row of a Grid.
Build with the factory helpers: GridTrack.autoSize (fit the content), GridTrack.pixels(n) (a fixed width/height), or GridTrack.percent(w) (a weighted share of the leftover space — the weights of all percent tracks are summed, so two percent(50) tracks split the remainder evenly, exactly like two percent(1) tracks would).