The CSSWG as agreed to publish a first Working Draft for Masonry layout – with the two major proposals merged where possible, and otherwise presented side by side. Most of the differences are syntax only.

Here's the Editor's Draft that will be published:

https://drafts.csswg.org/css-grid-3/

And the discussion:

https://github.com/w3c/csswg-drafts/issues/8195#issuecomment-2344098078

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