architecture of Servo, and how to consume Servo and its libraries. This book is a work in progress! In the table of contents, * denotes chapters that were recently added or imported from older docs, and still need selectors — CSS selector matching. servo — Entry points for the servo application and libservo embedding library. shared — Shared traits/code used by multiple components that don't want to depend on the such as block formatting contexts (for block flow), inline formatting contexts (for inline flow), table formatting contexts, and flex formatting contexts. Each formatting context has different rules for