This source offers a comprehensive technical lecture on the CSS Flexbox Layout Model, beginning with an overview of traditional CSS layout methods like block, inline, table, positioned, and float layouts, highlighting their limitations and the challenges they posedfor complex web designs. The lecture then details the motivations and design goals behind Flexbox, emphasizing its role in creating adaptive, dynamic, and one-dimensional layouts with powerful alignment and sizing controls. It proceeds to explain the fundamental concepts of Flexbox, such as flex containers, flex items, and the main/cross axis, followed by a breakdown of key CSS properties and a simplified walk-through of the Flex layout algorithm. Finally, the text explores Blink's (Chromium's rendering engine) implementation of Flexbox within its LayoutNG architecture, comparing it to Gecko (Firefox) and WebKit (Safari), and discusses Flexbox's integration with other CSS systems, accessibility considerations, and common edge cases or bugs.