Item Flow is a unified system that could generalize and replace today's layout-type specific Flexbox, Grid, and Masonry, and along with simplifying layout, would unlock new abilities.

> As we worked through the details, we started to get excited. Suddenly new features for Flexbox and Grid that people have wanted for years had an obvious home. Things seemed to click together elegantly. New capabilities emerged: (1) Flexbox could gain a way to do dense packing. (2) Grid could gain the ability to turn off wrapping (3) Masonry layouts could now be triggered with a value for item-flow, and more…

You can put 4 divs side by side in many ways, then jut put images in it.