https://RustRocket.rs -- Cloud Monk Losang Jinpa, Ph.D., MCSE / MCT, https://Rustaceans.rs, Full Stack Cloud Native Rust DevOps Engineer - Rocket Framework Rust Microservices on Kubernetes-AWS-Azure-GCP

“The alignment container is the rectangle that the alignment subject is aligned within. This is defined by the layout mode; it is usually the alignment subject's containing block, and assumes the writing mode of the box establishing the containing block.”

See also CSS Box Alignment

• JavaScript Alignment container
• https://developer.mozilla.org/en-US/docs/Glossary/Alignment_Container