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Reference

Using the multi-keyword syntax with CSS display: Describes the multi-keyword syntax and compares this syntax with legacy single-keyword values.
Block and inline layout in normal flow: The basics of how block and inline elements behave when they are part of the normal flow.
Flow layout and overflow: How overflow works when working with normal flow.
Flow layout and writing modes: How flow layout behaves when used with different document writing modes.
Introduction to formatting contexts: Formatting contexts, including block, inline, and flex, their behaviors, and use.
In flow and out of flow: What takes elements out of flow, and the effect of creating new Block Formatting Contexts.