A way to do container queries — create pixel based grids yet make them responsive and fluid
Demo
The ActiveGrids default is to work to a grid of 60px min-width columns and dynamically add classes to .ags elements dependent on their width, as the page loads. With your favourite JS library bind ActiveGrids to the window resize event and layouts will respond to browser resizing.
See index.html for a demo/testing page of sorts.
... documentation to come and a better demo page or two