Flex & Containers
Unlike the printed page, web content and context can be unpredictable. CSS provides tools to manage that uncertainty – either explicitly with tools like @media and container queries, or implicitly with flexbox.

CodePen Demos
- Flexbox is inline-ish
 - Flexbox alignment
 - CSS gradient-art decorations
 - Flex-basis layouts?
 - (Flex)box alignment
 - Block flow align-content
 - Alignment in absolute position
 - CSS is awesome
 - Media vs container
 - Understanding containment
 - Containing size
 - Enter the 36 chambers
 - Size queries, relative/var units
 - Flexbox cards, with container queries
 - Container query bookstore
 - Container query blinds v2
 - Style query button themes
 - Sticky header state query!
 
Resources
- Firefox flexbox inspector
 - Shorthand values
 - Can I use absolute position alignment
 - Responsive web design by Ethan Marcotte
 - Selector queries by Andy Hume
 - Being relaxed
 - Ancestor layout loops with single-axis containment
 - Propagating up in CSS by Jim Nielsen
 - The large, small, and dynamic viewports by Bramus Van Damme
 - Can I use container style queries
 - CSSWG issue for state queries
 - Chrome Explainer