[csswg-drafts] [css-grid] grid-auto-flow: normal for display: grid? (#13512)

fantasai has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-grid] grid-auto-flow: normal for display: grid? ==
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 conceivable break content?

Because if not... it is 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);
```

CC @bfgeek @tabatkins 

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/13512 using your GitHub account


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Received on Tuesday, 17 February 2026 22:19:54 UTC