Since we last reported on the back & forth regarding defining a "masonry layout" #CSS syntax, an intriguing development has transpired!
Jen Simmons et al. over at the WebKit Blog have written about a third possible path forward, and it has implications beyond merely implementing masonry layout. It is the initial steps towards formulating a unified layout system that blurs the lines between flexbox and grid. This new #WebDev concept is tentatively being called Item Flow.
https://thathtml.blog/2025/04/unified-layout-system-could-happen/