[css-grid] grid-auto-flow: normal for display: grid? #13512
Description
In Grid Level 3, we added a new initial behavior: if grid-template-rows is set but grid-template-columns is not (i.e. is none), then we interpret the rows as fixed tracks and grow in the inline direction.
Can we do this to display: grid also? Like, is there content out there in the wild where grid-template-rows is set, grid-template-columns is not, and grid-auto-flow is still its initial value, where making this change would conceivably break content?
Because if not... it would be a really smooth and nice author experience to have this create a sideways-growing grid, same as it creates a sideways-growing grid-lanes layout:
display: grid;
grid-template-rows: repeat(auto-fill, 100px);